dbus-unit.c 46.8 KB
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
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  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
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  (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
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  Lesser General Public License for more details.
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  You should have received a copy of the GNU Lesser General Public License
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  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

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#include <errno.h>

#include "dbus.h"
#include "log.h"
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#include "dbus-unit.h"
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#include "bus-errors.h"
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#include "dbus-common.h"
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#include "selinux-access.h"
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#include "cgroup-util.h"
#include "strv.h"
#include "path-util.h"
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#include "fileio.h"
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const char bus_unit_interface[] _introspect_("Unit") = BUS_UNIT_INTERFACE;
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#define INVALIDATING_PROPERTIES                 \
        "LoadState\0"                           \
        "ActiveState\0"                         \
        "SubState\0"                            \
        "InactiveExitTimestamp\0"               \
        "ActiveEnterTimestamp\0"                \
        "ActiveExitTimestamp\0"                 \
        "InactiveEnterTimestamp\0"              \
        "Job\0"                                 \
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        "NeedDaemonReload\0"
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static int bus_unit_append_names(DBusMessageIter *i, const char *property, void *data) {
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        char *t;
        Iterator j;
        DBusMessageIter sub;
        Unit *u = data;

        if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
                return -ENOMEM;

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        SET_FOREACH(t, u->names, j)
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                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;
}

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static int bus_unit_append_following(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data, *f;
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        const char *d;

        assert(i);
        assert(property);
        assert(u);

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        f = unit_following(u);
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        d = f ? f->id : "";
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        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
                return -ENOMEM;

        return 0;
}

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static int bus_unit_append_dependencies(DBusMessageIter *i, const char *property, void *data) {
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        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)
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                if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &u->id))
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                        return -ENOMEM;

        if (!dbus_message_iter_close_container(i, &sub))
                return -ENOMEM;

        return 0;
}

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static int bus_unit_append_description(DBusMessageIter *i, const char *property, void *data) {
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        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;
}

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static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_unit_append_load_state, unit_load_state, UnitLoadState);
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static int bus_unit_append_active_state(DBusMessageIter *i, const char *property, void *data) {
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        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;
}

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static int bus_unit_append_sub_state(DBusMessageIter *i, const char *property, void *data) {
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        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;
}

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static int bus_unit_append_file_state(DBusMessageIter *i, const char *property, void *data) {
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        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;
}

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static int bus_unit_append_can_start(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data;
        dbus_bool_t b;

        assert(i);
        assert(property);
        assert(u);

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        b = unit_can_start(u) &&
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                !u->refuse_manual_start;
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        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
                return -ENOMEM;

        return 0;
}

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static int bus_unit_append_can_stop(DBusMessageIter *i, const char *property, void *data) {
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        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) &&
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                !u->refuse_manual_stop;
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        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
                return -ENOMEM;

        return 0;
}

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static int bus_unit_append_can_reload(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data;
        dbus_bool_t b;

        assert(i);
        assert(property);
        assert(u);

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        b = unit_can_reload(u);
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        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
                return -ENOMEM;

        return 0;
}

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static int bus_unit_append_can_isolate(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data;
        dbus_bool_t b;

        assert(i);
        assert(property);
        assert(u);

        b = unit_can_isolate(u) &&
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                !u->refuse_manual_start;
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        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
                return -ENOMEM;

        return 0;
}

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static int bus_unit_append_job(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data;
        DBusMessageIter sub;
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        _cleanup_free_ char *p = NULL;
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        assert(i);
        assert(property);
        assert(u);

        if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
                return -ENOMEM;

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        if (u->job) {
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                p = job_dbus_path(u->job);
                if (!p)
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                        return -ENOMEM;

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                if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->job->id) ||
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                    !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p))
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                        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. */

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                p = unit_dbus_path(u);
                if (!p)
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                        return -ENOMEM;

                if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &id) ||
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                    !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p))
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                        return -ENOMEM;
        }

        if (!dbus_message_iter_close_container(i, &sub))
                return -ENOMEM;

        return 0;
}

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static int bus_unit_append_default_cgroup(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data;
        char *t;
        CGroupBonding *cgb;
        bool success;
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        assert(i);
        assert(property);
        assert(u);

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        cgb = unit_get_default_cgroup(u);
        if (cgb) {
                t = cgroup_bonding_to_string(cgb);
                if (!t)
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                        return -ENOMEM;
        } else
                t = (char*) "";
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        success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t);

        if (cgb)
                free(t);

        return success ? 0 : -ENOMEM;
}

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static int bus_unit_append_cgroups(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data;
        CGroupBonding *cgb;
        DBusMessageIter sub;

        if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
                return -ENOMEM;

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        LIST_FOREACH(by_unit, cgb, u->cgroup_bondings) {
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                char _cleanup_free_ *t = NULL;
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                bool success;

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                t = cgroup_bonding_to_string(cgb);
                if (!t)
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                        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;
}

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static int bus_unit_append_cgroup_attrs(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data;
        CGroupAttribute *a;
        DBusMessageIter sub, sub2;

        if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "(sss)", &sub))
                return -ENOMEM;

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        LIST_FOREACH(by_unit, a, u->cgroup_attributes) {
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                char _cleanup_free_ *v = NULL;
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                bool success;

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                if (a->semantics && a->semantics->map_write)
                        a->semantics->map_write(a->semantics, a->value, &v);
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                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;
}

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static int bus_unit_append_need_daemon_reload(DBusMessageIter *i, const char *property, void *data) {
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        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;
}

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static int bus_unit_append_load_error(DBusMessageIter *i, const char *property, void *data) {
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        Unit *u = data;
        const char *name, *message;
        DBusMessageIter sub;

        assert(i);
        assert(property);
        assert(u);

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        if (u->load_error != 0) {
                name = bus_errno_to_dbus(u->load_error);
                message = strempty(strerror(-u->load_error));
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        } 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;
}

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static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusConnection *connection, DBusMessage *message) {
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        _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
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        DBusError error;
        JobType job_type = _JOB_TYPE_INVALID;
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        bool reload_if_possible = false;
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        int r;
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        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;
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        else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "TryRestart"))
                job_type = JOB_TRY_RESTART;
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        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;
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        } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Kill")) {
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                const char *swho;
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                int32_t signo;
                KillWho who;

                if (!dbus_message_get_args(
                                    message,
                                    &error,
                                    DBUS_TYPE_STRING, &swho,
                                    DBUS_TYPE_INT32, &signo,
                                    DBUS_TYPE_INVALID))
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                        return bus_send_error_reply(connection, message, &error, -EINVAL);
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                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)
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                        return bus_send_error_reply(connection, message, &error, -EINVAL);
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                SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "stop");

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                r = unit_kill(u, who, signo, &error);
                if (r < 0)
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                        return bus_send_error_reply(connection, message, &error, r);
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                reply = dbus_message_new_method_return(message);
                if (!reply)
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                        goto oom;

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        } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ResetFailed")) {
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                SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "reload");

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                unit_reset_failed(u);
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                reply = dbus_message_new_method_return(message);
                if (!reply)
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                        goto oom;

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        } else if (streq_ptr(dbus_message_get_member(message), "SetControlGroup")) {
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                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;

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        } else if (streq_ptr(dbus_message_get_member(message), "UnsetControlGroup")) {
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                DBusMessageIter iter;

                SELINUX_UNIT_ACCESS_CHECK(u, connection, message, "stop");

                if (!dbus_message_iter_init(message, &iter))
                        goto oom;

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                r = bus_unit_cgroup_unset(u, &iter);
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                if (r < 0)
                        return bus_send_error_reply(connection, message, NULL, r);

                reply = dbus_message_new_method_return(message);
                if (!reply)
                        goto oom;
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        } else if (streq_ptr(dbus_message_get_member(message), "GetControlGroupAttribute")) {
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                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;

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        } else if (streq_ptr(dbus_message_get_member(message), "SetControlGroupAttribute")) {
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                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;

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        } else if (streq_ptr(dbus_message_get_member(message), "UnsetControlGroupAttribute")) {
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                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;

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        } else if (UNIT_VTABLE(u)->bus_message_handler)
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                return UNIT_VTABLE(u)->bus_message_handler(u, connection, message);
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        else
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                return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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        if (job_type != _JOB_TYPE_INVALID) {
                const char *smode;
                JobMode mode;
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                if (!dbus_message_get_args(
                                    message,
                                    &error,
                                    DBUS_TYPE_STRING, &smode,
                                    DBUS_TYPE_INVALID))
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                        return bus_send_error_reply(connection, message, &error, -EINVAL);
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                mode = job_mode_from_string(smode);
                if (mode < 0) {
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                        dbus_set_error(&error, BUS_ERROR_INVALID_JOB_MODE, "Job mode %s is invalid.", smode);
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                        return bus_send_error_reply(connection, message, &error, -EINVAL);
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                }
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                return bus_unit_queue_job(connection, message, u, job_type, mode, reload_if_possible);
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        }

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        if (reply)
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                if (!bus_maybe_send_reply(connection, message, reply))
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                        goto oom;

        return DBUS_HANDLER_RESULT_HANDLED;

oom:
        dbus_error_free(&error);
        return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}

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static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage  *message, void *data) {
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        Manager *m = data;
        Unit *u;
        int r;
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        _cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
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        DBusError error;
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        assert(connection);
        assert(message);
        assert(m);

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        dbus_error_init(&error);

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        if (streq(dbus_message_get_path(message), "/org/freedesktop/systemd1/unit")) {
                /* Be nice to gdbus and return introspection data for our mid-level paths */

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                SELINUX_ACCESS_CHECK(connection, message, "status");
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                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;

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                        reply = dbus_message_new_method_return(message);
                        if (!reply)
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                                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. */

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                        f = open_memstream(&introspection, &size);
                        if (!f)
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                                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;

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                                if (k != u->id)
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                                        continue;

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                                p = bus_path_escape(k);
                                if (!p) {
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                                        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);

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                        if (!bus_maybe_send_reply(connection, message, reply))
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                                goto oom;

                        return DBUS_HANDLER_RESULT_HANDLED;
                }

                return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
        }

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        r = manager_load_unit_from_dbus_path(m, dbus_message_get_path(message), &error, &u);
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        if (r == -ENOMEM)
                goto oom;
        if (r < 0)
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                return bus_send_error_reply(connection, message, &error, r);
690

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        return bus_unit_message_dispatch(u, connection, message);
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oom:
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        dbus_error_free(&error);

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        return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}

const DBusObjectPathVTable bus_unit_vtable = {
        .message_function = bus_unit_message_handler
};
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void bus_unit_send_change_signal(Unit *u) {
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        _cleanup_free_ char *p = NULL;
        _cleanup_dbus_message_unref_ DBusMessage *m = NULL;
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        assert(u);

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        if (u->in_dbus_queue) {
                LIST_REMOVE(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
                u->in_dbus_queue = false;
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        }
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        if (!u->id)
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                return;

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        if (!bus_has_subscriber(u->manager)) {
                u->sent_dbus_new_signal = true;
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                return;
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        }
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        p = unit_dbus_path(u);
        if (!p)
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                goto oom;

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        if (u->sent_dbus_new_signal) {
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                /* 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
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                 * behavior if needed. */
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                if (UNIT_VTABLE(u)->bus_invalidating_properties) {

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                        m = bus_properties_changed_new(p,
                                                       UNIT_VTABLE(u)->bus_interface,
                                                       UNIT_VTABLE(u)->bus_invalidating_properties);
                        if (!m)
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                                goto oom;

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                        if (bus_broadcast(u->manager, m) < 0)
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                                goto oom;
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                        dbus_message_unref(m);
                }

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                m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Unit",
                                               INVALIDATING_PROPERTIES);
                if (!m)
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                        goto oom;
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        } else {
                /* Send a new signal */

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                m = dbus_message_new_signal("/org/freedesktop/systemd1",
                                            "org.freedesktop.systemd1.Manager",
                                            "UnitNew");
                if (!m)
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                        goto oom;

                if (!dbus_message_append_args(m,
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                                              DBUS_TYPE_STRING, &u->id,
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                                              DBUS_TYPE_OBJECT_PATH, &p,
                                              DBUS_TYPE_INVALID))
                        goto oom;
        }

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        if (bus_broadcast(u->manager, m) < 0)
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                goto oom;

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        u->sent_dbus_new_signal = true;
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        return;

oom:
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        log_oom();
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}

void bus_unit_send_removed_signal(Unit *u) {
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        _cleanup_free_ char *p = NULL;
        _cleanup_dbus_message_unref_ DBusMessage *m = NULL;
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        assert(u);

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        if (!bus_has_subscriber(u->manager))
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                return;

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        if (!u->sent_dbus_new_signal)
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                bus_unit_send_change_signal(u);

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        if (!u->id)
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                return;

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        p = unit_dbus_path(u);
        if (!p)
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                goto oom;

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        m = dbus_message_new_signal("/org/freedesktop/systemd1",
                                    "org.freedesktop.systemd1.Manager",
                                    "UnitRemoved");
        if (!m)
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                goto oom;

        if (!dbus_message_append_args(m,
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                                      DBUS_TYPE_STRING, &u->id,
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                                      DBUS_TYPE_OBJECT_PATH, &p,
                                      DBUS_TYPE_INVALID))
                goto oom;

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        if (bus_broadcast(u->manager, m) < 0)
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                goto oom;

        return;

oom:
815
        log_oom();
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}
817

818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
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))) {
860 861
                dbus_set_error(&error, BUS_ERROR_ONLY_BY_DEPENDENCY,
                               "Operation refused, unit %s may be requested by dependency only.", u->id);
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                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;

889
        if (!bus_maybe_send_reply(connection, message, reply))
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                goto oom;

        return DBUS_HANDLER_RESULT_HANDLED;

oom:
        dbus_error_free(&error);

        return DBUS_HANDLER_RESULT_NEED_MEMORY;
}

900
static int parse_mode(DBusMessageIter *iter, bool *runtime, bool next) {
901
        const char *mode;
902
        int r;
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        assert(iter);
        assert(runtime);

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        r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &mode, next);
        if (r < 0)
                return r;
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        if (streq(mode, "runtime"))
                *runtime = true;
        else if (streq(mode, "persistent"))
                *runtime = false;
        else
                return -EINVAL;

        return 0;
}

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int bus_unit_cgroup_set(Unit *u, DBusMessageIter *iter) {
922 923 924
        _cleanup_free_ char *controller = NULL, *old_path = NULL, *new_path = NULL, *contents = NULL;
        const char *name;
        CGroupBonding *b;
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        bool runtime;
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        int r;
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        assert(u);
        assert(iter);

        if (!unit_get_exec_context(u))
                return -EINVAL;

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        r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &name, true);
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        if (r < 0)
                return r;

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        r = parse_mode(iter, &runtime, false);
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        if (r < 0)
                return r;

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        r = cg_split_spec(name, &controller, &new_path);
        if (r < 0)
                return r;
945

946 947 948 949 950
        if (!new_path) {
                new_path = unit_default_cgroup_path(u);
                if (!new_path)
                        return -ENOMEM;
        }
951

952 953
        if (!controller || streq(controller, SYSTEMD_CGROUP_CONTROLLER))
                return -EINVAL;
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        b = cgroup_bonding_find_list(u->cgroup_bondings, controller);
        if (b) {
                if (streq(b->path, new_path))
                        return 0;
959

960 961
                if (b->essential)
                        return -EINVAL;
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963 964
                old_path = strdup(b->path);
                if (!old_path)
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                        return -ENOMEM;
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        }
967

968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
        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);
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        }

987 988 989 990 991 992
        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);
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}

int bus_unit_cgroup_unset(Unit *u, DBusMessageIter *iter) {
996 997 998 999
        _cleanup_free_ char *controller = NULL, *path = NULL, *target = NULL;
        const char *name;
        CGroupAttribute *a, *n;
        CGroupBonding *b;
1000
        bool runtime;
1001
        int r;
1002 1003 1004 1005 1006 1007 1008

        assert(u);
        assert(iter);

        if (!unit_get_exec_context(u))
                return -EINVAL;

1009
        r = bus_iter_get_basic_and_next(iter, DBUS_TYPE_STRING, &name, true);
1010 1011 1012
        if (r < 0)
                return r;

1013
        r = parse_mode(iter, &runtime, false);
1014 1015 1016
        if (r < 0)
                return r;

1017 1018 1019
        r = cg_split_spec(name, &controller, &path);
        if (r < 0)
                return r;
1020

1021 1022
        if (!controller || streq(controller, SYSTEMD_CGROUP_CONTROLLER))
                return -EINVAL;
1023

1024 1025 1026
        b = cgroup_bonding_find_list(u->cgroup_bondings, controller);
        if (!b)
                return -ENOENT;
1027

1028 1029
        if (path && !path_equal(path, b->path))
                return -ENOENT;
1030

1031 1032
        if (b->essential)
                return -EINVAL;
1033

1034
        unit_remove_drop_in(u, runtime, controller);
1035

1036
        /* Try to migrate the old group away */
1037
        if (cg_pid_get_path(controller, 0, &target) >= 0)
1038 1039 1040
                cgroup_bonding_migrate_to(u->cgroup_bondings, target, false);

        cgroup_bonding_free(b, true);
1041

1042 1043 1044 1045
        /* Drop all attributes of this controller */
        LIST_FOREACH_SAFE(by_unit, a, n, u->cgroup_attributes) {
                if (!streq(a->controller, controller))
                        continue;
1046

1047 1048
                unit_remove_drop_in(u, runtime, a->name);
                cgroup_attribute_free(a);
1049 1050 1051 1052 1053
        }

        return 0;
}

1054
int bus_unit_cgroup_attribute_get(Unit *u, DBusMessageIter *iter, char ***_result) {
1055 1056 1057 1058 1059
        _cleanup_free_ char *controller = NULL;
        CGroupAttribute *a;
        CGroupBonding *b;
        const char *name;
        char **l = NULL;
1060 1061 1062 1063 1064 1065 1066 1067 1068
        int r;

        assert(u);
        assert(iter);
        assert(_result);

        if (!unit_get_exec_context(u))
                return -EINVAL;