sleep-util: split battery-capacity into sleep/

[thirdparty/systemd.git] / src / login / logind-dbus.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <errno.h>
#include <sys/stat.h>
#include <unistd.h>

#include "sd-device.h"
#include "sd-messages.h"

#include "alloc-util.h"
#include "audit-util.h"
#include "bootspec.h"
#include "bus-common-errors.h"
#include "bus-error.h"
#include "bus-get-properties.h"
#include "bus-locator.h"
#include "bus-polkit.h"
#include "bus-unit-util.h"
#include "bus-util.h"
#include "cgroup-util.h"
#include "device-util.h"
#include "dirent-util.h"
#include "efi-api.h"
#include "efi-loader.h"
#include "efivars.h"
#include "env-file.h"
#include "env-util.h"
#include "escape.h"
#include "event-util.h"
#include "fd-util.h"
#include "fileio-label.h"
#include "fileio.h"
#include "format-util.h"
#include "fs-util.h"
#include "logind-action.h"
#include "logind-dbus.h"
#include "logind-polkit.h"
#include "logind-seat-dbus.h"
#include "logind-session-dbus.h"
#include "logind-user-dbus.h"
#include "logind.h"
#include "missing_capability.h"
#include "mkdir-label.h"
#include "parse-util.h"
#include "path-util.h"
#include "process-util.h"
#include "reboot-util.h"
#include "selinux-util.h"
#include "sleep-util.h"
#include "special.h"
#include "serialize.h"
#include "stdio-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "tmpfile-util.h"
#include "unit-name.h"
#include "user-util.h"
#include "utmp-wtmp.h"
#include "virt.h"
#include "wall.h"

/* As a random fun fact sysvinit had a 252 (256-(strlen(" \r\n")+1))
 * character limit for the wall message.
 * https://git.savannah.nongnu.org/cgit/sysvinit.git/tree/src/shutdown.c#n72
 * There is no real technical need for that but doesn't make sense
 * to store arbitrary amounts either. As we are not stingy here, we
 * allow 4k.
 */
#define WALL_MESSAGE_MAX 4096U

#define SHUTDOWN_SCHEDULE_FILE "/run/systemd/shutdown/scheduled"

static int update_schedule_file(Manager *m);
static void reset_scheduled_shutdown(Manager *m);
static int manager_setup_shutdown_timers(Manager* m);

static int get_sender_session(
                Manager *m,
                sd_bus_message *message,
                bool consult_display,
                sd_bus_error *error,
                Session **ret) {

        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
        Session *session = NULL;
        const char *name;
        int r;

        /* Acquire the sender's session. This first checks if the sending process is inside a session itself,
         * and returns that. If not and 'consult_display' is true, this returns the display session of the
         * owning user of the caller. */

        r = sd_bus_query_sender_creds(message,
                                      SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT|
                                      (consult_display ? SD_BUS_CREDS_OWNER_UID : 0), &creds);
        if (r < 0)
                return r;

        r = sd_bus_creds_get_session(creds, &name);
        if (r < 0) {
                if (r != -ENXIO)
                        return r;

                if (consult_display) {
                        uid_t uid;

                        r = sd_bus_creds_get_owner_uid(creds, &uid);
                        if (r < 0) {
                                if (r != -ENXIO)
                                        return r;
                        } else {
                                User *user;

                                user = hashmap_get(m->users, UID_TO_PTR(uid));
                                if (user)
                                        session = user->display;
                        }
                }
        } else
                session = hashmap_get(m->sessions, name);

        if (!session)
                return sd_bus_error_setf(error, BUS_ERROR_NO_SESSION_FOR_PID,
                                         consult_display ?
                                         "Caller does not belong to any known session and doesn't own any suitable session." :
                                         "Caller does not belong to any known session.");

        *ret = session;
        return 0;
}

int manager_get_session_from_creds(
                Manager *m,
                sd_bus_message *message,
                const char *name,
                sd_bus_error *error,
                Session **ret) {

        Session *session;

        assert(m);
        assert(ret);

        if (SEAT_IS_SELF(name)) /* the caller's own session */
                return get_sender_session(m, message, false, error, ret);
        if (SEAT_IS_AUTO(name)) /* The caller's own session if they have one, otherwise their user's display session */
                return get_sender_session(m, message, true, error, ret);

        session = hashmap_get(m->sessions, name);
        if (!session)
                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);

        *ret = session;
        return 0;
}

static int get_sender_user(Manager *m, sd_bus_message *message, sd_bus_error *error, User **ret) {
        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
        uid_t uid;
        User *user;
        int r;

        /* Note that we get the owner UID of the session, not the actual client UID here! */
        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
        if (r < 0)
                return r;

        r = sd_bus_creds_get_owner_uid(creds, &uid);
        if (r < 0) {
                if (r != -ENXIO)
                        return r;

                user = NULL;
        } else
                user = hashmap_get(m->users, UID_TO_PTR(uid));

        if (!user)
                return sd_bus_error_setf(error, BUS_ERROR_NO_USER_FOR_PID,
                                         "Caller does not belong to any logged in or lingering user");

        *ret = user;
        return 0;
}

int manager_get_user_from_creds(Manager *m, sd_bus_message *message, uid_t uid, sd_bus_error *error, User **ret) {
        User *user;

        assert(m);
        assert(ret);

        if (!uid_is_valid(uid))
                return get_sender_user(m, message, error, ret);

        user = hashmap_get(m->users, UID_TO_PTR(uid));
        if (!user)
                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_USER,
                                         "User ID "UID_FMT" is not logged in or lingering", uid);

        *ret = user;
        return 0;
}

int manager_get_seat_from_creds(
                Manager *m,
                sd_bus_message *message,
                const char *name,
                sd_bus_error *error,
                Seat **ret) {

        Seat *seat;
        int r;

        assert(m);
        assert(ret);

        if (SEAT_IS_SELF(name) || SEAT_IS_AUTO(name)) {
                Session *session;

                /* Use these special seat names as session names */
                r = manager_get_session_from_creds(m, message, name, error, &session);
                if (r < 0)
                        return r;

                seat = session->seat;
                if (!seat)
                        return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "Session '%s' has no seat.", session->id);
        } else {
                seat = hashmap_get(m->seats, name);
                if (!seat)
                        return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT, "No seat '%s' known", name);
        }

        *ret = seat;
        return 0;
}

static int return_test_polkit(
                sd_bus_message *message,
                int capability,
                const char *action,
                const char **details,
                uid_t good_user,
                sd_bus_error *e) {

        const char *result;
        bool challenge;
        int r;

        r = bus_test_polkit(message, capability, action, details, good_user, &challenge, e);
        if (r < 0)
                return r;

        if (r > 0)
                result = "yes";
        else if (challenge)
                result = "challenge";
        else
                result = "no";

        return sd_bus_reply_method_return(message, "s", result);
}

static int property_get_idle_hint(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);

        assert(bus);
        assert(reply);

        return sd_bus_message_append(reply, "b", manager_get_idle_hint(m, NULL) > 0);
}

static int property_get_idle_since_hint(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);
        dual_timestamp t = DUAL_TIMESTAMP_NULL;

        assert(bus);
        assert(reply);

        manager_get_idle_hint(m, &t);

        return sd_bus_message_append(reply, "t", streq(property, "IdleSinceHint") ? t.realtime : t.monotonic);
}

static int property_get_inhibited(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);
        InhibitWhat w;

        assert(bus);
        assert(reply);

        w = manager_inhibit_what(m, streq(property, "BlockInhibited") ? INHIBIT_BLOCK : INHIBIT_DELAY);

        return sd_bus_message_append(reply, "s", inhibit_what_to_string(w));
}

static int property_get_preparing(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);
        bool b = false;

        assert(bus);
        assert(reply);

        if (m->delayed_action) {
                if (streq(property, "PreparingForShutdown"))
                        b = m->delayed_action->inhibit_what & INHIBIT_SHUTDOWN;
                else
                        b = m->delayed_action->inhibit_what & INHIBIT_SLEEP;
        }

        return sd_bus_message_append(reply, "b", b);
}

static int property_get_scheduled_shutdown(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);
        int r;

        assert(bus);
        assert(reply);

        r = sd_bus_message_open_container(reply, 'r', "st");
        if (r < 0)
                return r;

        r = sd_bus_message_append(reply, "st",
                m->scheduled_shutdown_action ? handle_action_to_string(m->scheduled_shutdown_action->handle) : NULL,
                m->scheduled_shutdown_timeout);
        if (r < 0)
                return r;

        return sd_bus_message_close_container(reply);
}

static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_handle_action, handle_action, HandleAction);
static BUS_DEFINE_PROPERTY_GET(property_get_docked, "b", Manager, manager_is_docked_or_external_displays);
static BUS_DEFINE_PROPERTY_GET(property_get_lid_closed, "b", Manager, manager_is_lid_closed);
static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_on_external_power, "b", manager_is_on_external_power());
static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_compat_user_tasks_max, "t", CGROUP_LIMIT_MAX);
static BUS_DEFINE_PROPERTY_GET_REF(property_get_hashmap_size, "t", Hashmap *, (uint64_t) hashmap_size);

static int method_get_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_free_ char *p = NULL;
        Manager *m = ASSERT_PTR(userdata);
        const char *name;
        Session *session;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &name);
        if (r < 0)
                return r;

        r = manager_get_session_from_creds(m, message, name, error, &session);
        if (r < 0)
                return r;

        p = session_bus_path(session);
        if (!p)
                return -ENOMEM;

        return sd_bus_reply_method_return(message, "o", p);
}

/* Get login session of a process.  This is not what you are looking for these days,
 * as apps may instead belong to a user service unit.  This includes terminal
 * emulators and hence command-line apps. */
static int method_get_session_by_pid(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_free_ char *p = NULL;
        Session *session = NULL;
        Manager *m = ASSERT_PTR(userdata);
        pid_t pid;
        int r;

        assert(message);

        assert_cc(sizeof(pid_t) == sizeof(uint32_t));

        r = sd_bus_message_read(message, "u", &pid);
        if (r < 0)
                return r;
        if (pid < 0)
                return -EINVAL;

        if (pid == 0) {
                r = manager_get_session_from_creds(m, message, NULL, error, &session);
                if (r < 0)
                        return r;
        } else {
                r = manager_get_session_by_pid(m, pid, &session);
                if (r < 0)
                        return r;

                if (!session)
                        return sd_bus_error_setf(error, BUS_ERROR_NO_SESSION_FOR_PID,
                                                 "PID "PID_FMT" does not belong to any known session", pid);
        }

        p = session_bus_path(session);
        if (!p)
                return -ENOMEM;

        return sd_bus_reply_method_return(message, "o", p);
}

static int method_get_user(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_free_ char *p = NULL;
        Manager *m = ASSERT_PTR(userdata);
        uint32_t uid;
        User *user;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "u", &uid);
        if (r < 0)
                return r;

        r = manager_get_user_from_creds(m, message, uid, error, &user);
        if (r < 0)
                return r;

        p = user_bus_path(user);
        if (!p)
                return -ENOMEM;

        return sd_bus_reply_method_return(message, "o", p);
}

static int method_get_user_by_pid(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_free_ char *p = NULL;
        Manager *m = ASSERT_PTR(userdata);
        User *user = NULL;
        pid_t pid;
        int r;

        assert(message);

        assert_cc(sizeof(pid_t) == sizeof(uint32_t));

        r = sd_bus_message_read(message, "u", &pid);
        if (r < 0)
                return r;
        if (pid < 0)
                return -EINVAL;

        if (pid == 0) {
                r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
                if (r < 0)
                        return r;
        } else {
                r = manager_get_user_by_pid(m, pid, &user);
                if (r < 0)
                        return r;
                if (!user)
                        return sd_bus_error_setf(error, BUS_ERROR_NO_USER_FOR_PID,
                                                 "PID "PID_FMT" does not belong to any logged in user or lingering user",
                                                 pid);
        }

        p = user_bus_path(user);
        if (!p)
                return -ENOMEM;

        return sd_bus_reply_method_return(message, "o", p);
}

static int method_get_seat(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_free_ char *p = NULL;
        Manager *m = ASSERT_PTR(userdata);
        const char *name;
        Seat *seat;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &name);
        if (r < 0)
                return r;

        r = manager_get_seat_from_creds(m, message, name, error, &seat);
        if (r < 0)
                return r;

        p = seat_bus_path(seat);
        if (!p)
                return -ENOMEM;

        return sd_bus_reply_method_return(message, "o", p);
}

static int method_list_sessions(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        int r;

        assert(message);

        r = sd_bus_message_new_method_return(message, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_open_container(reply, 'a', "(susso)");
        if (r < 0)
                return r;

        HASHMAP_FOREACH(session, m->sessions) {
                _cleanup_free_ char *p = NULL;

                p = session_bus_path(session);
                if (!p)
                        return -ENOMEM;

                r = sd_bus_message_append(reply, "(susso)",
                                          session->id,
                                          (uint32_t) session->user->user_record->uid,
                                          session->user->user_record->user_name,
                                          session->seat ? session->seat->id : "",
                                          p);
                if (r < 0)
                        return r;
        }

        r = sd_bus_message_close_container(reply);
        if (r < 0)
                return r;

        return sd_bus_send(NULL, reply, NULL);
}

static int method_list_users(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        Manager *m = ASSERT_PTR(userdata);
        User *user;
        int r;

        assert(message);

        r = sd_bus_message_new_method_return(message, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_open_container(reply, 'a', "(uso)");
        if (r < 0)
                return r;

        HASHMAP_FOREACH(user, m->users) {
                _cleanup_free_ char *p = NULL;

                p = user_bus_path(user);
                if (!p)
                        return -ENOMEM;

                r = sd_bus_message_append(reply, "(uso)",
                                          (uint32_t) user->user_record->uid,
                                          user->user_record->user_name,
                                          p);
                if (r < 0)
                        return r;
        }

        r = sd_bus_message_close_container(reply);
        if (r < 0)
                return r;

        return sd_bus_send(NULL, reply, NULL);
}

static int method_list_seats(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        Manager *m = ASSERT_PTR(userdata);
        Seat *seat;
        int r;

        assert(message);

        r = sd_bus_message_new_method_return(message, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_open_container(reply, 'a', "(so)");
        if (r < 0)
                return r;

        HASHMAP_FOREACH(seat, m->seats) {
                _cleanup_free_ char *p = NULL;

                p = seat_bus_path(seat);
                if (!p)
                        return -ENOMEM;

                r = sd_bus_message_append(reply, "(so)", seat->id, p);
                if (r < 0)
                        return r;
        }

        r = sd_bus_message_close_container(reply);
        if (r < 0)
                return r;

        return sd_bus_send(NULL, reply, NULL);
}

static int method_list_inhibitors(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        Manager *m = ASSERT_PTR(userdata);
        Inhibitor *inhibitor;
        int r;

        assert(message);

        r = sd_bus_message_new_method_return(message, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_open_container(reply, 'a', "(ssssuu)");
        if (r < 0)
                return r;

        HASHMAP_FOREACH(inhibitor, m->inhibitors) {

                r = sd_bus_message_append(reply, "(ssssuu)",
                                          strempty(inhibit_what_to_string(inhibitor->what)),
                                          strempty(inhibitor->who),
                                          strempty(inhibitor->why),
                                          strempty(inhibit_mode_to_string(inhibitor->mode)),
                                          (uint32_t) inhibitor->uid,
                                          (uint32_t) inhibitor->pid.pid);
                if (r < 0)
                        return r;
        }

        r = sd_bus_message_close_container(reply);
        if (r < 0)
                return r;

        return sd_bus_send(NULL, reply, NULL);
}

static int method_create_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        const char *service, *type, *class, *cseat, *tty, *display, *remote_user, *remote_host, *desktop;
        _cleanup_free_ char *id = NULL;
        Session *session = NULL;
        uint32_t audit_id = 0;
        Manager *m = ASSERT_PTR(userdata);
        User *user = NULL;
        Seat *seat = NULL;
        pid_t leader;
        uid_t uid;
        int remote;
        uint32_t vtnr = 0;
        SessionType t;
        SessionClass c;
        int r;

        assert(message);

        assert_cc(sizeof(pid_t) == sizeof(uint32_t));
        assert_cc(sizeof(uid_t) == sizeof(uint32_t));

        r = sd_bus_message_read(message, "uusssssussbss",
                                &uid, &leader, &service, &type, &class, &desktop, &cseat,
                                &vtnr, &tty, &display, &remote, &remote_user, &remote_host);
        if (r < 0)
                return r;

        if (!uid_is_valid(uid))
                return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid UID");
        if (leader < 0 || leader == 1 || leader == getpid_cached())
                return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid leader PID");

        if (isempty(type))
                t = _SESSION_TYPE_INVALID;
        else {
                t = session_type_from_string(type);
                if (t < 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "Invalid session type %s", type);
        }

        if (isempty(class))
                c = _SESSION_CLASS_INVALID;
        else {
                c = session_class_from_string(class);
                if (c < 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "Invalid session class %s", class);
        }

        if (isempty(desktop))
                desktop = NULL;
        else {
                if (!string_is_safe(desktop))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "Invalid desktop string %s", desktop);
        }

        if (isempty(cseat))
                seat = NULL;
        else {
                seat = hashmap_get(m->seats, cseat);
                if (!seat)
                        return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SEAT,
                                                 "No seat '%s' known", cseat);
        }

        if (tty_is_vc(tty)) {
                int v;

                if (!seat)
                        seat = m->seat0;
                else if (seat != m->seat0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "TTY %s is virtual console but seat %s is not seat0", tty, seat->id);

                v = vtnr_from_tty(tty);
                if (v <= 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "Cannot determine VT number from virtual console TTY %s", tty);

                if (vtnr == 0)
                        vtnr = (uint32_t) v;
                else if (vtnr != (uint32_t) v)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "Specified TTY and VT number do not match");

        } else if (tty_is_console(tty)) {

                if (!seat)
                        seat = m->seat0;
                else if (seat != m->seat0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "Console TTY specified but seat is not seat0");

                if (vtnr != 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "Console TTY specified but VT number is not 0");
        }

        if (seat) {
                if (seat_has_vts(seat)) {
                        if (vtnr <= 0 || vtnr > 63)
                                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                         "VT number out of range");
                } else {
                        if (vtnr != 0)
                                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                         "Seat has no VTs but VT number not 0");
                }
        }

        if (t == _SESSION_TYPE_INVALID) {
                if (!isempty(display))
                        t = SESSION_X11;
                else if (!isempty(tty))
                        t = SESSION_TTY;
                else
                        t = SESSION_UNSPECIFIED;
        }

        if (c == _SESSION_CLASS_INVALID) {
                if (t == SESSION_UNSPECIFIED)
                        c = SESSION_BACKGROUND;
                else
                        c = SESSION_USER;
        }

        if (leader == 0) {
                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;

                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_t*) &leader);
                if (r < 0)
                        return r;
        }

        /* Check if we are already in a logind session. Or if we are in user@.service
         * which is a special PAM session that avoids creating a logind session. */
        r = manager_get_user_by_pid(m, leader, NULL);
        if (r < 0)
                return r;
        if (r > 0)
                return sd_bus_error_setf(error, BUS_ERROR_SESSION_BUSY,
                                         "Already running in a session or user slice");

        /*
         * Old gdm and lightdm start the user-session on the same VT as
         * the greeter session. But they destroy the greeter session
         * after the user-session and want the user-session to take
         * over the VT. We need to support this for
         * backwards-compatibility, so make sure we allow new sessions
         * on a VT that a greeter is running on. Furthermore, to allow
         * re-logins, we have to allow a greeter to take over a used VT for
         * the exact same reasons.
         */
        if (c != SESSION_GREETER &&
            vtnr > 0 &&
            vtnr < MALLOC_ELEMENTSOF(m->seat0->positions) &&
            m->seat0->positions[vtnr] &&
            m->seat0->positions[vtnr]->class != SESSION_GREETER)
                return sd_bus_error_set(error, BUS_ERROR_SESSION_BUSY, "Already occupied by a session");

        if (hashmap_size(m->sessions) >= m->sessions_max)
                return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED,
                                         "Maximum number of sessions (%" PRIu64 ") reached, refusing further sessions.",
                                         m->sessions_max);

        (void) audit_session_from_pid(leader, &audit_id);
        if (audit_session_is_valid(audit_id)) {
                /* Keep our session IDs and the audit session IDs in sync */

                if (asprintf(&id, "%"PRIu32, audit_id) < 0)
                        return -ENOMEM;

                /* Wut? There's already a session by this name and we didn't find it above? Weird, then let's
                 * not trust the audit data and let's better register a new ID */
                if (hashmap_contains(m->sessions, id)) {
                        log_warning("Existing logind session ID %s used by new audit session, ignoring.", id);
                        audit_id = AUDIT_SESSION_INVALID;
                        id = mfree(id);
                }
        }

        if (!id) {
                do {
                        id = mfree(id);

                        if (asprintf(&id, "c%" PRIu64, ++m->session_counter) < 0)
                                return -ENOMEM;

                } while (hashmap_contains(m->sessions, id));
        }

        /* The generated names should not clash with 'auto' or 'self' */
        assert(!SESSION_IS_SELF(id));
        assert(!SESSION_IS_AUTO(id));

        /* If we are not watching utmp already, try again */
        manager_reconnect_utmp(m);

        r = manager_add_user_by_uid(m, uid, &user);
        if (r < 0)
                goto fail;

        r = manager_add_session(m, id, &session);
        if (r < 0)
                goto fail;

        session_set_user(session, user);
        r = session_set_leader(session, leader);
        if (r < 0)
                goto fail;

        session->original_type = session->type = t;
        session->class = c;
        session->remote = remote;
        session->vtnr = vtnr;

        if (!isempty(tty)) {
                session->tty = strdup(tty);
                if (!session->tty) {
                        r = -ENOMEM;
                        goto fail;
                }

                session->tty_validity = TTY_FROM_PAM;
        }

        if (!isempty(display)) {
                session->display = strdup(display);
                if (!session->display) {
                        r = -ENOMEM;
                        goto fail;
                }
        }

        if (!isempty(remote_user)) {
                session->remote_user = strdup(remote_user);
                if (!session->remote_user) {
                        r = -ENOMEM;
                        goto fail;
                }
        }

        if (!isempty(remote_host)) {
                session->remote_host = strdup(remote_host);
                if (!session->remote_host) {
                        r = -ENOMEM;
                        goto fail;
                }
        }

        if (!isempty(service)) {
                session->service = strdup(service);
                if (!session->service) {
                        r = -ENOMEM;
                        goto fail;
                }
        }

        if (!isempty(desktop)) {
                session->desktop = strdup(desktop);
                if (!session->desktop) {
                        r = -ENOMEM;
                        goto fail;
                }
        }

        if (seat) {
                r = seat_attach_session(seat, session);
                if (r < 0)
                        goto fail;
        }

        r = sd_bus_message_enter_container(message, 'a', "(sv)");
        if (r < 0)
                goto fail;

        r = session_start(session, message, error);
        if (r < 0)
                goto fail;

        r = sd_bus_message_exit_container(message);
        if (r < 0)
                goto fail;

        session->create_message = sd_bus_message_ref(message);

        /* Now, let's wait until the slice unit and stuff got created. We send the reply back from
         * session_send_create_reply(). */

        return 1;

fail:
        if (session)
                session_add_to_gc_queue(session);

        if (user)
                user_add_to_gc_queue(user);

        return r;
}

static int method_release_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        const char *name;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &name);
        if (r < 0)
                return r;

        r = manager_get_session_from_creds(m, message, name, error, &session);
        if (r < 0)
                return r;

        r = session_release(session);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

static int method_activate_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        const char *name;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &name);
        if (r < 0)
                return r;

        r = manager_get_session_from_creds(m, message, name, error, &session);
        if (r < 0)
                return r;

        /* PolicyKit is done by bus_session_method_activate() */

        return bus_session_method_activate(message, session, error);
}

static int method_activate_session_on_seat(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        const char *session_name, *seat_name;
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        Seat *seat;
        int r;

        assert(message);

        /* Same as ActivateSession() but refuses to work if the seat doesn't match */

        r = sd_bus_message_read(message, "ss", &session_name, &seat_name);
        if (r < 0)
                return r;

        r = manager_get_session_from_creds(m, message, session_name, error, &session);
        if (r < 0)
                return r;

        r = manager_get_seat_from_creds(m, message, seat_name, error, &seat);
        if (r < 0)
                return r;

        if (session->seat != seat)
                return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT,
                                         "Session %s not on seat %s", session_name, seat_name);

        r = check_polkit_chvt(message, m, error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Will call us back */

        r = session_activate(session);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

static int method_lock_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        const char *name;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &name);
        if (r < 0)
                return r;

        r = manager_get_session_from_creds(m, message, name, error, &session);
        if (r < 0)
                return r;

        return bus_session_method_lock(message, session, error);
}

static int method_lock_sessions(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        int r;

        assert(message);

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.login1.lock-sessions",
                        NULL,
                        false,
                        UID_INVALID,
                        &m->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Will call us back */

        r = session_send_lock_all(m, streq(sd_bus_message_get_member(message), "LockSessions"));
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

static int method_kill_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        const char *name;
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &name);
        if (r < 0)
                return r;

        r = manager_get_session_from_creds(m, message, name, error, &session);
        if (r < 0)
                return r;

        return bus_session_method_kill(message, session, error);
}

static int method_kill_user(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        uint32_t uid;
        User *user;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "u", &uid);
        if (r < 0)
                return r;

        r = manager_get_user_from_creds(m, message, uid, error, &user);
        if (r < 0)
                return r;

        return bus_user_method_kill(message, user, error);
}

static int method_terminate_session(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        const char *name;
        Session *session;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &name);
        if (r < 0)
                return r;

        r = manager_get_session_from_creds(m, message, name, error, &session);
        if (r < 0)
                return r;

        return bus_session_method_terminate(message, session, error);
}

static int method_terminate_user(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        uint32_t uid;
        User *user;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "u", &uid);
        if (r < 0)
                return r;

        r = manager_get_user_from_creds(m, message, uid, error, &user);
        if (r < 0)
                return r;

        return bus_user_method_terminate(message, user, error);
}

static int method_terminate_seat(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        const char *name;
        Seat *seat;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &name);
        if (r < 0)
                return r;

        r = manager_get_seat_from_creds(m, message, name, error, &seat);
        if (r < 0)
                return r;

        return bus_seat_method_terminate(message, seat, error);
}

static int method_set_user_linger(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
        _cleanup_free_ char *cc = NULL;
        Manager *m = ASSERT_PTR(userdata);
        int r, b, interactive;
        struct passwd *pw;
        const char *path;
        uint32_t uid, auth_uid;

        assert(message);

        r = sd_bus_message_read(message, "ubb", &uid, &b, &interactive);
        if (r < 0)
                return r;

        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID |
                                               SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
        if (r < 0)
                return r;

        if (!uid_is_valid(uid)) {
                /* Note that we get the owner UID of the session or user unit,
                 * not the actual client UID here! */
                r = sd_bus_creds_get_owner_uid(creds, &uid);
                if (r < 0)
                        return r;
        }

        /* owner_uid is racy, so for authorization we must use euid */
        r = sd_bus_creds_get_euid(creds, &auth_uid);
        if (r < 0)
                return r;

        errno = 0;
        pw = getpwuid(uid);
        if (!pw)
                return errno_or_else(ENOENT);

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_ADMIN,
                        uid == auth_uid ? "org.freedesktop.login1.set-self-linger" :
                                          "org.freedesktop.login1.set-user-linger",
                        NULL,
                        interactive,
                        UID_INVALID,
                        &m->polkit_registry,
                        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 */

        (void) mkdir_p_label("/var/lib/systemd", 0755);
        r = mkdir_safe_label("/var/lib/systemd/linger", 0755, 0, 0, MKDIR_WARN_MODE);
        if (r < 0)
                return r;

        cc = cescape(pw->pw_name);
        if (!cc)
                return -ENOMEM;

        path = strjoina("/var/lib/systemd/linger/", cc);
        if (b) {
                User *u;

                r = touch(path);
                if (r < 0)
                        return r;

                if (manager_add_user_by_uid(m, uid, &u) >= 0)
                        user_start(u);

        } else {
                User *u;

                r = unlink(path);
                if (r < 0 && errno != ENOENT)
                        return -errno;

                u = hashmap_get(m->users, UID_TO_PTR(uid));
                if (u)
                        user_add_to_gc_queue(u);
        }

        return sd_bus_reply_method_return(message, NULL);
}

static int trigger_device(Manager *m, sd_device *parent) {
        _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
        int r;

        assert(m);

        r = sd_device_enumerator_new(&e);
        if (r < 0)
                return r;

        r = sd_device_enumerator_allow_uninitialized(e);
        if (r < 0)
                return r;

        if (parent) {
                r = sd_device_enumerator_add_match_parent(e, parent);
                if (r < 0)
                        return r;
        }

        FOREACH_DEVICE(e, d) {
                r = sd_device_trigger(d, SD_DEVICE_CHANGE);
                if (r < 0)
                        log_device_debug_errno(d, r, "Failed to trigger device, ignoring: %m");
        }

        return 0;
}

static int attach_device(Manager *m, const char *seat, const char *sysfs, sd_bus_error *error) {
        _cleanup_(sd_device_unrefp) sd_device *d = NULL;
        _cleanup_free_ char *rule = NULL, *file = NULL;
        const char *id_for_seat;
        int r;

        assert(m);
        assert(seat);
        assert(sysfs);

        r = sd_device_new_from_syspath(&d, sysfs);
        if (r < 0)
                return sd_bus_error_set_errnof(error, r, "Failed to open device '%s': %m", sysfs);

        if (sd_device_has_current_tag(d, "seat") <= 0)
                return sd_bus_error_set_errnof(error, ENODEV, "Device '%s' lacks 'seat' udev tag.", sysfs);

        if (sd_device_get_property_value(d, "ID_FOR_SEAT", &id_for_seat) < 0)
                return sd_bus_error_set_errnof(error, ENODEV, "Device '%s' lacks 'ID_FOR_SEAT' udev property.", sysfs);

        if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0)
                return -ENOMEM;

        if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0)
                return -ENOMEM;

        (void) mkdir_p_label("/etc/udev/rules.d", 0755);
        r = write_string_file_atomic_label(file, rule);
        if (r < 0)
                return r;

        return trigger_device(m, d);
}

static int flush_devices(Manager *m) {
        _cleanup_closedir_ DIR *d = NULL;

        assert(m);

        d = opendir("/etc/udev/rules.d");
        if (!d) {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to open /etc/udev/rules.d: %m");
        } else
                FOREACH_DIRENT_ALL(de, d, break) {
                        if (!dirent_is_file(de))
                                continue;

                        if (!startswith(de->d_name, "72-seat-"))
                                continue;

                        if (!endswith(de->d_name, ".rules"))
                                continue;

                        if (unlinkat(dirfd(d), de->d_name, 0) < 0)
                                log_warning_errno(errno, "Failed to unlink %s: %m", de->d_name);
                }

        return trigger_device(m, NULL);
}

static int method_attach_device(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        const char *sysfs, *seat;
        Manager *m = ASSERT_PTR(userdata);
        int interactive, r;

        assert(message);

        r = sd_bus_message_read(message, "ssb", &seat, &sysfs, &interactive);
        if (r < 0)
                return r;

        if (!path_is_normalized(sysfs))
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not normalized", sysfs);
        if (!path_startswith(sysfs, "/sys"))
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not in /sys", sysfs);

        if (SEAT_IS_SELF(seat) || SEAT_IS_AUTO(seat)) {
                Seat *found;

                r = manager_get_seat_from_creds(m, message, seat, error, &found);
                if (r < 0)
                        return r;

                seat = found->id;

        } else if (!seat_name_is_valid(seat)) /* Note that a seat does not have to exist yet for this operation to succeed */
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Seat name %s is not valid", seat);

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.login1.attach-device",
                        NULL,
                        interactive,
                        UID_INVALID,
                        &m->polkit_registry,
                        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 = attach_device(m, seat, sysfs, error);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

static int method_flush_devices(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        int interactive, r;

        assert(message);

        r = sd_bus_message_read(message, "b", &interactive);
        if (r < 0)
                return r;

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.login1.flush-devices",
                        NULL,
                        interactive,
                        UID_INVALID,
                        &m->polkit_registry,
                        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 = flush_devices(m);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

static int have_multiple_sessions(
                Manager *m,
                uid_t uid) {

        Session *session;

        assert(m);

        /* Check for other users' sessions. Greeter sessions do not
         * count, and non-login sessions do not count either. */
        HASHMAP_FOREACH(session, m->sessions)
                if (session->class == SESSION_USER &&
                    session->user->user_record->uid != uid)
                        return true;

        return false;
}

static int bus_manager_log_shutdown(
                Manager *m,
                const HandleActionData *a) {
        assert(m);
        assert(a);

        const char *message = a->message ?: "System is shutting down";
        const char *log_verb = a->log_verb ? strjoina("SHUTDOWN=", a->log_verb) : NULL;

        return log_struct(LOG_NOTICE,
                          "MESSAGE_ID=%s", a->message_id ?: SD_MESSAGE_SHUTDOWN_STR,
                          LOG_MESSAGE("%s%s%s%s.",
                                      message,
                                      m->wall_message ? " (" : "",
                                      strempty(m->wall_message),
                                      m->wall_message ? ")" : ""),
                          log_verb);
}

static int lid_switch_ignore_handler(sd_event_source *e, uint64_t usec, void *userdata) {
        Manager *m = ASSERT_PTR(userdata);

        assert(e);

        m->lid_switch_ignore_event_source = sd_event_source_unref(m->lid_switch_ignore_event_source);
        return 0;
}

int manager_set_lid_switch_ignore(Manager *m, usec_t until) {
        int r;

        assert(m);

        if (until <= now(CLOCK_MONOTONIC))
                return 0;

        /* We want to ignore the lid switch for a while after each
         * suspend, and after boot-up. Hence let's install a timer for
         * this. As long as the event source exists we ignore the lid
         * switch. */

        if (m->lid_switch_ignore_event_source) {
                usec_t u;

                r = sd_event_source_get_time(m->lid_switch_ignore_event_source, &u);
                if (r < 0)
                        return r;

                if (until <= u)
                        return 0;

                r = sd_event_source_set_time(m->lid_switch_ignore_event_source, until);
        } else
                r = sd_event_add_time(
                                m->event,
                                &m->lid_switch_ignore_event_source,
                                CLOCK_MONOTONIC,
                                until, 0,
                                lid_switch_ignore_handler, m);

        return r;
}

static int send_prepare_for(Manager *m, const HandleActionData *a, bool _active) {
        int k = 0, r, active = _active;

        assert(m);
        assert(a);
        assert(IN_SET(a->inhibit_what, INHIBIT_SHUTDOWN, INHIBIT_SLEEP));

        /* We need to send both old and new signal for backward compatibility. The newer one allows clients
         * to know which type of reboot is going to happen, as they might be doing different actions (e.g.:
         * on soft-reboot), and it is sent first, so that clients know that if they receive the old one
         * first then they don't have to wait for the new one, as it means it's not supported. So, do not
         * change the order here, as it is an API. */
        if (a->inhibit_what == INHIBIT_SHUTDOWN) {
                k = sd_bus_emit_signal(m->bus,
                                       "/org/freedesktop/login1",
                                       "org.freedesktop.login1.Manager",
                                       "PrepareForShutdownWithMetadata",
                                       "ba{sv}",
                                       active,
                                       1,
                                       "type",
                                       "s",
                                       handle_action_to_string(a->handle));
                if (k < 0)
                        log_debug_errno(k, "Failed to emit PrepareForShutdownWithMetadata(): %m");
        }

        r = sd_bus_emit_signal(m->bus,
                               "/org/freedesktop/login1",
                               "org.freedesktop.login1.Manager",
                               a->inhibit_what == INHIBIT_SHUTDOWN ? "PrepareForShutdown" : "PrepareForSleep",
                               "b",
                               active);
        if (r < 0)
                log_debug_errno(r, "Failed to emit PrepareForShutdown(): %m");

        return RET_GATHER(k, r);
}

static int execute_shutdown_or_sleep(
                Manager *m,
                const HandleActionData *a,
                sd_bus_error *error) {

        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        const char *p;
        int r;

        assert(m);
        assert(a);

        if (a->inhibit_what == INHIBIT_SHUTDOWN)
                bus_manager_log_shutdown(m, a);

        r = bus_call_method(
                        m->bus,
                        bus_systemd_mgr,
                        "StartUnit",
                        error,
                        &reply,
                        "ss", a->target, "replace-irreversibly");
        if (r < 0)
                goto error;

        r = sd_bus_message_read(reply, "o", &p);
        if (r < 0)
                goto error;

        r = free_and_strdup(&m->action_job, p);
        if (r < 0)
                goto error;

        m->delayed_action = a;

        /* Make sure the lid switch is ignored for a while */
        manager_set_lid_switch_ignore(m, usec_add(now(CLOCK_MONOTONIC), m->holdoff_timeout_usec));

        return 0;

error:
        /* Tell people that they now may take a lock again */
        (void) send_prepare_for(m, a, false);

        return r;
}

int manager_dispatch_delayed(Manager *manager, bool timeout) {
        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
        Inhibitor *offending = NULL;
        int r;

        assert(manager);

        if (!manager->delayed_action || manager->action_job)
                return 0;

        if (manager_is_inhibited(manager, manager->delayed_action->inhibit_what, INHIBIT_DELAY, NULL, false, false, 0, &offending)) {
                _cleanup_free_ char *comm = NULL, *u = NULL;

                if (!timeout)
                        return 0;

                (void) get_process_comm(offending->pid.pid, &comm);
                u = uid_to_name(offending->uid);

                log_notice("Delay lock is active (UID "UID_FMT"/%s, PID "PID_FMT"/%s) but inhibitor timeout is reached.",
                           offending->uid, strna(u),
                           offending->pid.pid, strna(comm));
        }

        /* Actually do the operation */
        r = execute_shutdown_or_sleep(manager, manager->delayed_action, &error);
        if (r < 0) {
                log_warning("Error during inhibitor-delayed operation (already returned success to client): %s",
                            bus_error_message(&error, r));

                manager->delayed_action = NULL;
        }

        return 1; /* We did some work. */
}

static int manager_inhibit_timeout_handler(
                        sd_event_source *s,
                        uint64_t usec,
                        void *userdata) {

        Manager *manager = ASSERT_PTR(userdata);

        assert(manager->inhibit_timeout_source == s);

        return manager_dispatch_delayed(manager, true);
}

static int delay_shutdown_or_sleep(
                Manager *m,
                const HandleActionData *a) {

        int r;

        assert(m);
        assert(a);

        if (m->inhibit_timeout_source) {
                r = sd_event_source_set_time_relative(m->inhibit_timeout_source, m->inhibit_delay_max);
                if (r < 0)
                        return log_error_errno(r, "sd_event_source_set_time_relative() failed: %m");

                r = sd_event_source_set_enabled(m->inhibit_timeout_source, SD_EVENT_ONESHOT);
                if (r < 0)
                        return log_error_errno(r, "sd_event_source_set_enabled() failed: %m");
        } else {
                r = sd_event_add_time_relative(
                                m->event,
                                &m->inhibit_timeout_source,
                                CLOCK_MONOTONIC, m->inhibit_delay_max, 0,
                                manager_inhibit_timeout_handler, m);
                if (r < 0)
                        return r;
        }

        m->delayed_action = a;

        return 0;
}

int bus_manager_shutdown_or_sleep_now_or_later(
                Manager *m,
                const HandleActionData *a,
                sd_bus_error *error) {

        _cleanup_free_ char *load_state = NULL;
        bool delayed;
        int r;

        assert(m);
        assert(a);
        assert(!m->action_job);

        r = unit_load_state(m->bus, a->target, &load_state);
        if (r < 0)
                return r;

        if (!streq(load_state, "loaded"))
                return log_notice_errno(SYNTHETIC_ERRNO(EACCES),
                                        "Unit %s is %s, refusing operation.",
                                        a->target, load_state);

        /* Tell everybody to prepare for shutdown/sleep */
        (void) send_prepare_for(m, a, true);

        delayed =
                m->inhibit_delay_max > 0 &&
                manager_is_inhibited(m, a->inhibit_what, INHIBIT_DELAY, NULL, false, false, 0, NULL);

        if (delayed)
                /* Shutdown is delayed, keep in mind what we
                 * want to do, and start a timeout */
                r = delay_shutdown_or_sleep(m, a);
        else
                /* Shutdown is not delayed, execute it
                 * immediately */
                r = execute_shutdown_or_sleep(m, a, error);

        return r;
}

static int verify_shutdown_creds(
                Manager *m,
                sd_bus_message *message,
                const HandleActionData *a,
                uint64_t flags,
                sd_bus_error *error) {

        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
        bool multiple_sessions, blocked, interactive;
        uid_t uid;
        int r;

        assert(m);
        assert(a);
        assert(message);

        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
        if (r < 0)
                return r;

        r = sd_bus_creds_get_euid(creds, &uid);
        if (r < 0)
                return r;

        r = have_multiple_sessions(m, uid);
        if (r < 0)
                return r;

        multiple_sessions = r > 0;
        blocked = manager_is_inhibited(m, a->inhibit_what, INHIBIT_BLOCK, NULL, false, true, uid, NULL);
        interactive = flags & SD_LOGIND_INTERACTIVE;

        if (multiple_sessions) {
                r = bus_verify_polkit_async(
                                message,
                                CAP_SYS_BOOT,
                                a->polkit_action_multiple_sessions,
                                NULL,
                                interactive,
                                UID_INVALID,
                                &m->polkit_registry,
                                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 */
        }

        if (blocked) {
                /* We don't check polkit for root here, because you can't be more privileged than root */
                if (uid == 0 && (flags & SD_LOGIND_ROOT_CHECK_INHIBITORS))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED,
                                                 "Access denied to root due to active block inhibitor");

                r = bus_verify_polkit_async(message,
                                CAP_SYS_BOOT,
                                a->polkit_action_ignore_inhibit,
                                NULL,
                                interactive,
                                UID_INVALID,
                                &m->polkit_registry,
                                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 */
        }

        if (!multiple_sessions && !blocked) {
                r = bus_verify_polkit_async(message,
                                CAP_SYS_BOOT,
                                a->polkit_action,
                                NULL,
                                interactive,
                                UID_INVALID,
                                &m->polkit_registry,
                                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 */
        }

        return 0;
}

static int setup_wall_message_timer(Manager *m, sd_bus_message* message) {
        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
        int r;

        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_AUGMENT|SD_BUS_CREDS_TTY|SD_BUS_CREDS_UID, &creds);
        if (r >= 0) {
                const char *tty = NULL;

                (void) sd_bus_creds_get_uid(creds, &m->scheduled_shutdown_uid);
                (void) sd_bus_creds_get_tty(creds, &tty);

                r = free_and_strdup(&m->scheduled_shutdown_tty, tty);
                if (r < 0)
                        return log_oom();
        }

        r = manager_setup_wall_message_timer(m);
        if (r < 0)
                return r;

        return 0;
}

static int method_do_shutdown_or_sleep(
                Manager *m,
                sd_bus_message *message,
                const HandleActionData *a,
                bool with_flags,
                sd_bus_error *error) {

        uint64_t flags;
        int r;

        assert(m);
        assert(message);
        assert(a);

        if (with_flags) {
                /* New style method: with flags parameter (and interactive bool in the bus message header) */
                r = sd_bus_message_read(message, "t", &flags);
                if (r < 0)
                        return r;
                if ((flags & ~SD_LOGIND_SHUTDOWN_AND_SLEEP_FLAGS_PUBLIC) != 0)
                        return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS,
                                                "Invalid flags parameter");

                if (FLAGS_SET(flags, (SD_LOGIND_REBOOT_VIA_KEXEC|SD_LOGIND_SOFT_REBOOT)))
                        return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS,
                                                "Both reboot via kexec and soft reboot selected, which is not supported");

                if (a->handle != HANDLE_REBOOT) {
                        if (flags & SD_LOGIND_REBOOT_VIA_KEXEC)
                                return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS,
                                                        "Reboot via kexec option is only applicable with reboot operations");
                        if (flags & SD_LOGIND_SOFT_REBOOT)
                                return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS,
                                                        "Soft reboot option is only applicable with reboot operations");
                }
        } else {
                /* Old style method: no flags parameter, but interactive bool passed as boolean in
                 * payload. Let's convert this argument to the new-style flags parameter for our internal
                 * use. */
                int interactive;

                r = sd_bus_message_read(message, "b", &interactive);
                if (r < 0)
                        return r;

                flags = interactive ? SD_LOGIND_INTERACTIVE : 0;
        }

        if ((flags & SD_LOGIND_REBOOT_VIA_KEXEC) && kexec_loaded())
                a = handle_action_lookup(HANDLE_KEXEC);
        else if ((flags & SD_LOGIND_SOFT_REBOOT))
                a = handle_action_lookup(HANDLE_SOFT_REBOOT);

        /* Don't allow multiple jobs being executed at the same time */
        if (m->delayed_action)
                return sd_bus_error_setf(error, BUS_ERROR_OPERATION_IN_PROGRESS,
                                         "There's already a shutdown or sleep operation in progress");

        if (a->sleep_operation >= 0) {
                r = can_sleep(a->sleep_operation);
                if (r == -ENOSPC)
                        return sd_bus_error_set(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED,
                                                "Not enough suitable swap space for hibernation available on compatible block devices and file systems");
                if (r == 0)
                        return sd_bus_error_setf(error, BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED,
                                                 "Sleep verb \"%s\" not supported",
                                                 sleep_operation_to_string(a->sleep_operation));
                if (r < 0)
                        return r;
        }

        r = verify_shutdown_creds(m, message, a, flags, error);
        if (r != 0)
                return r;

        /* reset case we're shorting a scheduled shutdown */
        m->unlink_nologin = false;
        reset_scheduled_shutdown(m);

        m->scheduled_shutdown_timeout = 0;
        m->scheduled_shutdown_action = a;

        (void) setup_wall_message_timer(m, message);

        r = bus_manager_shutdown_or_sleep_now_or_later(m, a, error);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

static int method_poweroff(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_do_shutdown_or_sleep(
                        m, message,
                        handle_action_lookup(HANDLE_POWEROFF),
                        sd_bus_message_is_method_call(message, NULL, "PowerOffWithFlags"),
                        error);
}

static int method_reboot(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_do_shutdown_or_sleep(
                        m, message,
                        handle_action_lookup(HANDLE_REBOOT),
                        sd_bus_message_is_method_call(message, NULL, "RebootWithFlags"),
                        error);
}

static int method_halt(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_do_shutdown_or_sleep(
                        m, message,
                        handle_action_lookup(HANDLE_HALT),
                        sd_bus_message_is_method_call(message, NULL, "HaltWithFlags"),
                        error);
}

static int method_suspend(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_do_shutdown_or_sleep(
                        m, message,
                        handle_action_lookup(HANDLE_SUSPEND),
                        sd_bus_message_is_method_call(message, NULL, "SuspendWithFlags"),
                        error);
}

static int method_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_do_shutdown_or_sleep(
                        m, message,
                        handle_action_lookup(HANDLE_HIBERNATE),
                        sd_bus_message_is_method_call(message, NULL, "HibernateWithFlags"),
                        error);
}

static int method_hybrid_sleep(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_do_shutdown_or_sleep(
                        m, message,
                        handle_action_lookup(HANDLE_HYBRID_SLEEP),
                        sd_bus_message_is_method_call(message, NULL, "HybridSleepWithFlags"),
                        error);
}

static int method_suspend_then_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_do_shutdown_or_sleep(
                        m, message,
                        handle_action_lookup(HANDLE_SUSPEND_THEN_HIBERNATE),
                        sd_bus_message_is_method_call(message, NULL, "SuspendThenHibernateWithFlags"),
                        error);
}

static int nologin_timeout_handler(
                        sd_event_source *s,
                        uint64_t usec,
                        void *userdata) {

        Manager *m = userdata;

        log_info("Creating /run/nologin, blocking further logins...");

        m->unlink_nologin =
                create_shutdown_run_nologin_or_warn() >= 0;

        return 0;
}

static usec_t nologin_timeout_usec(usec_t elapse) {
        /* Issue /run/nologin five minutes before shutdown */
        return LESS_BY(elapse, 5 * USEC_PER_MINUTE);
}

void manager_load_scheduled_shutdown(Manager *m) {
        _cleanup_fclose_ FILE *f = NULL;
        _cleanup_free_ char *usec = NULL,
               *warn_wall = NULL,
               *mode = NULL,
               *wall_message = NULL,
               *uid = NULL,
               *tty = NULL;
        int r;

        assert(m);

        r = parse_env_file(f, SHUTDOWN_SCHEDULE_FILE,
                        "USEC", &usec,
                        "WARN_WALL", &warn_wall,
                        "MODE", &mode,
                        "WALL_MESSAGE", &wall_message,
                        "UID", &uid,
                        "TTY", &tty);

        /* reset will delete the file */
        reset_scheduled_shutdown(m);

        if (r == -ENOENT)
                return;
        if (r < 0)
                return (void) log_debug_errno(r, "Failed to parse " SHUTDOWN_SCHEDULE_FILE ": %m");

        HandleAction handle = handle_action_from_string(mode);
        if (handle < 0)
                return (void) log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse scheduled shutdown type: %s", mode);

        if (!usec)
                return (void) log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "USEC is required");
        if (deserialize_usec(usec, &m->scheduled_shutdown_timeout) < 0)
                return;

        /* assign parsed type only after we know usec is also valid */
        m->scheduled_shutdown_action = handle_action_lookup(handle);

        if (warn_wall) {
                r = parse_boolean(warn_wall);
                if (r < 0)
                        log_debug_errno(r, "Failed to parse enabling wall messages");
                else
                        m->enable_wall_messages = r;
        }

        if (wall_message) {
                _cleanup_free_ char *unescaped = NULL;
                r = cunescape(wall_message, 0, &unescaped);
                if (r < 0)
                        log_debug_errno(r, "Failed to parse wall message: %s", wall_message);
                else
                        free_and_replace(m->wall_message, unescaped);
        }

        if (uid) {
                r = parse_uid(uid, &m->scheduled_shutdown_uid);
                if (r < 0)
                        log_debug_errno(r, "Failed to parse wall uid: %s", uid);
        }

        free_and_replace(m->scheduled_shutdown_tty, tty);

        r = manager_setup_shutdown_timers(m);
        if (r < 0)
                return reset_scheduled_shutdown(m);

        (void) manager_setup_wall_message_timer(m);
        (void) update_schedule_file(m);

        return;
}

static int update_schedule_file(Manager *m) {
        _cleanup_(unlink_and_freep) char *temp_path = NULL;
        _cleanup_fclose_ FILE *f = NULL;
        int r;

        assert(m);
        assert(m->scheduled_shutdown_action);

        r = mkdir_parents_label(SHUTDOWN_SCHEDULE_FILE, 0755);
        if (r < 0)
                return log_error_errno(r, "Failed to create shutdown subdirectory: %m");

        r = fopen_temporary(SHUTDOWN_SCHEDULE_FILE, &f, &temp_path);
        if (r < 0)
                return log_error_errno(r, "Failed to save information about scheduled shutdowns: %m");

        (void) fchmod(fileno(f), 0644);

        serialize_usec(f, "USEC", m->scheduled_shutdown_timeout);
        serialize_item_format(f, "WARN_WALL", "%s", one_zero(m->enable_wall_messages));
        serialize_item_format(f, "MODE", "%s", handle_action_to_string(m->scheduled_shutdown_action->handle));
        serialize_item_format(f, "UID", UID_FMT, m->scheduled_shutdown_uid);

        if (m->scheduled_shutdown_tty)
                serialize_item_format(f, "TTY", "%s", m->scheduled_shutdown_tty);

        if (!isempty(m->wall_message)) {
                r = serialize_item_escaped(f, "WALL_MESSAGE", m->wall_message);
                if (r < 0)
                        goto fail;
        }

        r = fflush_and_check(f);
        if (r < 0)
                goto fail;

        if (rename(temp_path, SHUTDOWN_SCHEDULE_FILE) < 0) {
                r = -errno;
                goto fail;
        }

        temp_path = mfree(temp_path);
        return 0;

fail:
        (void) unlink(SHUTDOWN_SCHEDULE_FILE);

        return log_error_errno(r, "Failed to write information about scheduled shutdowns: %m");
}

static void reset_scheduled_shutdown(Manager *m) {
        assert(m);

        m->scheduled_shutdown_timeout_source = sd_event_source_unref(m->scheduled_shutdown_timeout_source);
        m->wall_message_timeout_source = sd_event_source_unref(m->wall_message_timeout_source);
        m->nologin_timeout_source = sd_event_source_unref(m->nologin_timeout_source);

        m->scheduled_shutdown_action = NULL;
        m->scheduled_shutdown_timeout = USEC_INFINITY;
        m->scheduled_shutdown_uid = UID_INVALID;
        m->scheduled_shutdown_tty = mfree(m->scheduled_shutdown_tty);
        m->wall_message = mfree(m->wall_message);
        m->shutdown_dry_run = false;

        if (m->unlink_nologin) {
                (void) unlink_or_warn("/run/nologin");
                m->unlink_nologin = false;
        }

        (void) unlink(SHUTDOWN_SCHEDULE_FILE);
}

static int manager_scheduled_shutdown_handler(
                        sd_event_source *s,
                        uint64_t usec,
                        void *userdata) {

        const HandleActionData *a = NULL;
        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
        Manager *m = ASSERT_PTR(userdata);
        int r;

        a = m->scheduled_shutdown_action;
        assert(a);

        /* Don't allow multiple jobs being executed at the same time */
        if (m->delayed_action) {
                r = -EALREADY;
                log_error("Scheduled shutdown to %s failed: shutdown or sleep operation already in progress", a->target);
                goto error;
        }

        if (m->shutdown_dry_run) {
                /* We do not process delay inhibitors here.  Otherwise, we
                 * would have to be considered "in progress" (like the check
                 * above) for some seconds after our admin has seen the final
                 * wall message. */

                bus_manager_log_shutdown(m, a);
                log_info("Running in dry run, suppressing action.");
                reset_scheduled_shutdown(m);

                return 0;
        }

        r = bus_manager_shutdown_or_sleep_now_or_later(m, m->scheduled_shutdown_action, &error);
        if (r < 0) {
                log_error_errno(r, "Scheduled shutdown to %s failed: %m", a->target);
                goto error;
        }

        return 0;

error:
        reset_scheduled_shutdown(m);
        return r;
}

static int method_schedule_shutdown(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        HandleAction handle;
        const HandleActionData *a;
        uint64_t elapse;
        char *type;
        int r;
        bool dry_run = false;

        assert(message);

        r = sd_bus_message_read(message, "st", &type, &elapse);
        if (r < 0)
                return r;

        if (startswith(type, "dry-")) {
                type += 4;
                dry_run = true;
        }

        handle = handle_action_from_string(type);
        if (!IN_SET(handle, HANDLE_POWEROFF, HANDLE_REBOOT, HANDLE_SOFT_REBOOT, HANDLE_HALT, HANDLE_KEXEC))
                return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Unsupported shutdown type");

        a = handle_action_lookup(handle);
        assert(a);
        assert(a->polkit_action);

        r = verify_shutdown_creds(m, message, a, 0, error);
        if (r != 0)
                return r;

        m->scheduled_shutdown_action = a;
        m->shutdown_dry_run = dry_run;
        m->scheduled_shutdown_timeout = elapse;

        r = manager_setup_shutdown_timers(m);
        if (r < 0)
                return r;

        r = setup_wall_message_timer(m, message);
        if (r >= 0)
                r = update_schedule_file(m);

        if (r < 0) {
                reset_scheduled_shutdown(m);
                return r;
        }

        return sd_bus_reply_method_return(message, NULL);
}

static int manager_setup_shutdown_timers(Manager* m) {
        int r;

        r = event_reset_time(m->event, &m->scheduled_shutdown_timeout_source,
                             CLOCK_REALTIME,
                             m->scheduled_shutdown_timeout, 0,
                             manager_scheduled_shutdown_handler, m,
                             0, "scheduled-shutdown-timeout", true);
        if (r < 0)
                goto fail;

        r = event_reset_time(m->event, &m->nologin_timeout_source,
                             CLOCK_REALTIME,
                             nologin_timeout_usec(m->scheduled_shutdown_timeout), 0,
                             nologin_timeout_handler, m,
                             0, "nologin-timeout", true);
        if (r < 0)
                goto fail;

        return 0;

fail:
        m->scheduled_shutdown_timeout_source = sd_event_source_unref(m->scheduled_shutdown_timeout_source);
        m->nologin_timeout_source = sd_event_source_unref(m->nologin_timeout_source);

        return r;
}

static int method_cancel_scheduled_shutdown(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        const HandleActionData *a;
        bool cancelled;
        int r;

        assert(message);

        cancelled = m->scheduled_shutdown_action
                && !IN_SET(m->scheduled_shutdown_action->handle, HANDLE_IGNORE, _HANDLE_ACTION_INVALID);
        if (!cancelled)
                return sd_bus_reply_method_return(message, "b", false);

        a = m->scheduled_shutdown_action;
        if (!a->polkit_action)
                return sd_bus_error_set(error, SD_BUS_ERROR_AUTH_FAILED, "Unsupported shutdown type");

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_BOOT,
                        a->polkit_action,
                        NULL,
                        false,
                        UID_INVALID,
                        &m->polkit_registry,
                        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 */

        if (m->enable_wall_messages) {
                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
                const char *tty = NULL;
                uid_t uid = 0;

                r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_AUGMENT|SD_BUS_CREDS_TTY|SD_BUS_CREDS_UID, &creds);
                if (r >= 0) {
                        (void) sd_bus_creds_get_uid(creds, &uid);
                        (void) sd_bus_creds_get_tty(creds, &tty);
                }

                _cleanup_free_ char *username = uid_to_name(uid);

                log_struct(LOG_INFO,
                           LOG_MESSAGE("System shutdown has been cancelled"),
                           "ACTION=%s", handle_action_to_string(a->handle),
                           "MESSAGE_ID=" SD_MESSAGE_SHUTDOWN_CANCELED_STR,
                           username ? "OPERATOR=%s" : NULL, username);

                (void) wall("System shutdown has been cancelled",
                            username, tty, logind_wall_tty_filter, m);
        }

        reset_scheduled_shutdown(m);

        return sd_bus_reply_method_return(message, "b", true);
}

static int method_can_shutdown_or_sleep(
                Manager *m,
                sd_bus_message *message,
                const HandleActionData *a,
                sd_bus_error *error) {

        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
        bool multiple_sessions, challenge, blocked;
        const char *result = NULL;
        uid_t uid;
        int r;

        assert(m);
        assert(message);
        assert(a);

        if (a->sleep_operation >= 0) {
                r = can_sleep(a->sleep_operation);
                if (IN_SET(r,  0, -ENOSPC))
                        return sd_bus_reply_method_return(message, "s", "na");
                if (r < 0)
                        return r;
        }

        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
        if (r < 0)
                return r;

        r = sd_bus_creds_get_euid(creds, &uid);
        if (r < 0)
                return r;

        r = have_multiple_sessions(m, uid);
        if (r < 0)
                return r;

        multiple_sessions = r > 0;
        blocked = manager_is_inhibited(m, a->inhibit_what, INHIBIT_BLOCK, NULL, false, true, uid, NULL);

        HandleAction handle = handle_action_from_string(sleep_operation_to_string(a->sleep_operation));
        if (handle >= 0) {
                const char *target;

                target = handle_action_lookup(handle)->target;
                if (target) {
                        _cleanup_free_ char *load_state = NULL;

                        r = unit_load_state(m->bus, target, &load_state);
                        if (r < 0)
                                return r;

                        if (!streq(load_state, "loaded")) {
                                result = "no";
                                goto finish;
                        }
                }
        }

        if (multiple_sessions) {
                r = bus_test_polkit(message, CAP_SYS_BOOT, a->polkit_action_multiple_sessions, NULL, UID_INVALID, &challenge, error);
                if (r < 0)
                        return r;

                if (r > 0)
                        result = "yes";
                else if (challenge)
                        result = "challenge";
                else
                        result = "no";
        }

        if (blocked) {
                r = bus_test_polkit(message, CAP_SYS_BOOT, a->polkit_action_ignore_inhibit, NULL, UID_INVALID, &challenge, error);
                if (r < 0)
                        return r;

                if (r > 0) {
                        if (!result)
                                result = "yes";
                } else if (challenge) {
                        if (!result || streq(result, "yes"))
                                result = "challenge";
                } else
                        result = "no";
        }

        if (!multiple_sessions && !blocked) {
                /* If neither inhibit nor multiple sessions
                 * apply then just check the normal policy */

                r = bus_test_polkit(message, CAP_SYS_BOOT, a->polkit_action, NULL, UID_INVALID, &challenge, error);
                if (r < 0)
                        return r;

                if (r > 0)
                        result = "yes";
                else if (challenge)
                        result = "challenge";
                else
                        result = "no";
        }

 finish:
        return sd_bus_reply_method_return(message, "s", result);
}

static int method_can_poweroff(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_can_shutdown_or_sleep(
                        m, message, handle_action_lookup(HANDLE_POWEROFF),
                        error);
}

static int method_can_reboot(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_can_shutdown_or_sleep(
                        m, message, handle_action_lookup(HANDLE_REBOOT),
                        error);
}

static int method_can_halt(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_can_shutdown_or_sleep(
                        m, message, handle_action_lookup(HANDLE_HALT),
                        error);
}

static int method_can_suspend(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_can_shutdown_or_sleep(
                        m, message, handle_action_lookup(HANDLE_SUSPEND),
                        error);
}

static int method_can_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_can_shutdown_or_sleep(
                        m, message, handle_action_lookup(HANDLE_HIBERNATE),
                        error);
}

static int method_can_hybrid_sleep(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_can_shutdown_or_sleep(
                        m, message, handle_action_lookup(HANDLE_HYBRID_SLEEP),
                        error);
}

static int method_can_suspend_then_hibernate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = userdata;

        return method_can_shutdown_or_sleep(
                        m, message, handle_action_lookup(HANDLE_SUSPEND_THEN_HIBERNATE),
                        error);
}

static int property_get_reboot_parameter(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {
        _cleanup_free_ char *parameter = NULL;
        int r;

        assert(bus);
        assert(reply);
        assert(userdata);

        r = read_reboot_parameter(&parameter);
        if (r < 0)
                return r;

        return sd_bus_message_append(reply, "s", parameter);
}

static int method_set_reboot_parameter(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);
        const char *arg;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &arg);
        if (r < 0)
                return r;

        r = detect_container();
        if (r < 0)
                return r;
        if (r > 0)
                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED,
                                         "Reboot parameter not supported in containers, refusing.");

        r = bus_verify_polkit_async(message,
                                    CAP_SYS_ADMIN,
                                    "org.freedesktop.login1.set-reboot-parameter",
                                    NULL,
                                    false,
                                    UID_INVALID,
                                    &m->polkit_registry,
                                    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 = update_reboot_parameter_and_warn(arg, false);
        if (r < 0)
                return r;

        return sd_bus_reply_method_return(message, NULL);
}

static int method_can_reboot_parameter(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        _unused_ Manager *m = ASSERT_PTR(userdata);
        int r;

        assert(message);

        r = detect_container();
        if (r < 0)
                return r;
        if (r > 0) /* Inside containers, specifying a reboot parameter, doesn't make much sense */
                return sd_bus_reply_method_return(message, "s", "na");

        return return_test_polkit(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.login1.set-reboot-parameter",
                        NULL,
                        UID_INVALID,
                        error);
}

static int property_get_reboot_to_firmware_setup(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {
        int r;

        assert(bus);
        assert(reply);
        assert(userdata);

        r = getenv_bool("SYSTEMD_REBOOT_TO_FIRMWARE_SETUP");
        if (r == -ENXIO) {
                /* EFI case: let's see what is currently configured in the EFI variables */
                r = efi_get_reboot_to_firmware();
                if (r < 0 && r != -EOPNOTSUPP)
                        log_warning_errno(r, "Failed to determine reboot-to-firmware-setup state: %m");
        } else if (r < 0)
                log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_FIRMWARE_SETUP: %m");
        else if (r > 0) {
                /* Non-EFI case: let's see whether /run/systemd/reboot-to-firmware-setup exists. */
                if (access("/run/systemd/reboot-to-firmware-setup", F_OK) < 0) {
                        if (errno != ENOENT)
                                log_warning_errno(errno, "Failed to check whether /run/systemd/reboot-to-firmware-setup exists: %m");

                        r = false;
                } else
                        r = true;
        }

        return sd_bus_message_append(reply, "b", r > 0);
}

static int method_set_reboot_to_firmware_setup(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);
        bool use_efi;
        int b, r;

        assert(message);

        r = sd_bus_message_read(message, "b", &b);
        if (r < 0)
                return r;

        r = getenv_bool("SYSTEMD_REBOOT_TO_FIRMWARE_SETUP");
        if (r == -ENXIO) {
                /* EFI case: let's see what the firmware supports */

                r = efi_reboot_to_firmware_supported();
                if (r == -EOPNOTSUPP)
                        return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Firmware does not support boot into firmware.");
                if (r < 0)
                        return r;

                use_efi = true;

        } else if (r <= 0) {
                /* non-EFI case: $SYSTEMD_REBOOT_TO_FIRMWARE_SETUP is set to off */

                if (r < 0)
                        log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_FIRMWARE_SETUP: %m");

                return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Firmware does not support boot into firmware.");
        } else
                /* non-EFI case: $SYSTEMD_REBOOT_TO_FIRMWARE_SETUP is set to on */
                use_efi = false;

        r = bus_verify_polkit_async(message,
                                    CAP_SYS_ADMIN,
                                    "org.freedesktop.login1.set-reboot-to-firmware-setup",
                                    NULL,
                                    false,
                                    UID_INVALID,
                                    &m->polkit_registry,
                                    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 */

        if (use_efi) {
                r = efi_set_reboot_to_firmware(b);
                if (r < 0)
                        return r;
        } else {
                if (b) {
                        r = touch("/run/systemd/reboot-to-firmware-setup");
                        if (r < 0)
                                return r;
                } else {
                        if (unlink("/run/systemd/reboot-to-firmware-setup") < 0 && errno != ENOENT)
                                return -errno;
                }
        }

        return sd_bus_reply_method_return(message, NULL);
}

static int method_can_reboot_to_firmware_setup(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        _unused_ Manager *m = ASSERT_PTR(userdata);
        int r;

        assert(message);

        r = getenv_bool("SYSTEMD_REBOOT_TO_FIRMWARE_SETUP");
        if (r == -ENXIO) {
                /* EFI case: let's see what the firmware supports */

                r = efi_reboot_to_firmware_supported();
                if (r < 0) {
                        if (r != -EOPNOTSUPP)
                                log_warning_errno(r, "Failed to determine whether reboot to firmware is supported: %m");

                        return sd_bus_reply_method_return(message, "s", "na");
                }

        } else if (r <= 0) {
                /* Non-EFI case: let's trust $SYSTEMD_REBOOT_TO_FIRMWARE_SETUP */

                if (r < 0)
                        log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_FIRMWARE_SETUP: %m");

                return sd_bus_reply_method_return(message, "s", "na");
        }

        return return_test_polkit(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.login1.set-reboot-to-firmware-setup",
                        NULL,
                        UID_INVALID,
                        error);
}

static int property_get_reboot_to_boot_loader_menu(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        uint64_t x = UINT64_MAX;
        int r;

        assert(bus);
        assert(reply);
        assert(userdata);

        r = getenv_bool("SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU");
        if (r == -ENXIO) {
                /* EFI case: returns the current value of LoaderConfigTimeoutOneShot. Three cases are distinguished:
                 *
                 *     1. Variable not set, boot into boot loader menu is not enabled (we return UINT64_MAX to the user)
                 *     2. Variable set to "0", boot into boot loader menu is enabled with no timeout (we return 0 to the user)
                 *     3. Variable set to numeric value formatted in ASCII, boot into boot loader menu with the specified timeout in seconds
                 */

                r = efi_loader_get_config_timeout_one_shot(&x);
                if (r < 0) {
                        if (r != -ENOENT)
                                log_warning_errno(r, "Failed to read LoaderConfigTimeoutOneShot variable, ignoring: %m");
                }

        } else if (r < 0)
                log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU: %m");
        else if (r > 0) {
                _cleanup_free_ char *v = NULL;

                /* Non-EFI case, let's process /run/systemd/reboot-to-boot-loader-menu. */

                r = read_one_line_file("/run/systemd/reboot-to-boot-loader-menu", &v);
                if (r < 0) {
                        if (r != -ENOENT)
                                log_warning_errno(r, "Failed to read /run/systemd/reboot-to-boot-loader-menu: %m");
                } else {
                        r = safe_atou64(v, &x);
                        if (r < 0)
                                log_warning_errno(r, "Failed to parse /run/systemd/reboot-to-boot-loader-menu: %m");
                }
        }

        return sd_bus_message_append(reply, "t", x);
}

static int method_set_reboot_to_boot_loader_menu(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);
        bool use_efi;
        uint64_t x;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "t", &x);
        if (r < 0)
                return r;

        r = getenv_bool("SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU");
        if (r == -ENXIO) {
                uint64_t features;

                /* EFI case: let's see if booting into boot loader menu is supported. */

                r = efi_loader_get_features(&features);
                if (r < 0)
                        log_warning_errno(r, "Failed to determine whether reboot to boot loader menu is supported: %m");
                if (r < 0 || !FLAGS_SET(features, EFI_LOADER_FEATURE_CONFIG_TIMEOUT_ONE_SHOT))
                        return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Boot loader does not support boot into boot loader menu.");

                use_efi = true;

        } else if (r <= 0) {
                /* non-EFI case: $SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU is set to off */

                if (r < 0)
                        log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU: %m");

                return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Boot loader does not support boot into boot loader menu.");
        } else
                /* non-EFI case: $SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU is set to on */
                use_efi = false;

        r = bus_verify_polkit_async(message,
                                    CAP_SYS_ADMIN,
                                    "org.freedesktop.login1.set-reboot-to-boot-loader-menu",
                                    NULL,
                                    false,
                                    UID_INVALID,
                                    &m->polkit_registry,
                                    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 */

        if (use_efi) {
                if (x == UINT64_MAX)
                        r = efi_set_variable(EFI_LOADER_VARIABLE(LoaderConfigTimeoutOneShot), NULL, 0);
                else {
                        char buf[DECIMAL_STR_MAX(uint64_t) + 1];
                        xsprintf(buf, "%" PRIu64, DIV_ROUND_UP(x, USEC_PER_SEC)); /* second granularity */

                        r = efi_set_variable_string(EFI_LOADER_VARIABLE(LoaderConfigTimeoutOneShot), buf);
                }
                if (r < 0)
                        return r;
        } else {
                if (x == UINT64_MAX) {
                        if (unlink("/run/systemd/reboot-to-boot-loader-menu") < 0 && errno != ENOENT)
                                return -errno;
                } else {
                        char buf[DECIMAL_STR_MAX(uint64_t) + 1];

                        xsprintf(buf, "%" PRIu64, x); /* μs granularity */

                        r = write_string_file_atomic_label("/run/systemd/reboot-to-boot-loader-menu", buf);
                        if (r < 0)
                                return r;
                }
        }

        return sd_bus_reply_method_return(message, NULL);
}

static int method_can_reboot_to_boot_loader_menu(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        _unused_ Manager *m = ASSERT_PTR(userdata);
        int r;

        assert(message);

        r = getenv_bool("SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU");
        if (r == -ENXIO) {
                uint64_t features = 0;

                /* EFI case, let's see if booting into boot loader menu is supported. */

                r = efi_loader_get_features(&features);
                if (r < 0)
                        log_warning_errno(r, "Failed to determine whether reboot to boot loader menu is supported: %m");
                if (r < 0 || !FLAGS_SET(features, EFI_LOADER_FEATURE_CONFIG_TIMEOUT_ONE_SHOT))
                        return sd_bus_reply_method_return(message, "s", "na");

        } else if (r <= 0) {
                /* Non-EFI case: let's trust $SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU */

                if (r < 0)
                        log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU: %m");

                return sd_bus_reply_method_return(message, "s", "na");
        }

        return return_test_polkit(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.login1.set-reboot-to-boot-loader-menu",
                        NULL,
                        UID_INVALID,
                        error);
}

static int property_get_reboot_to_boot_loader_entry(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        _cleanup_free_ char *v = NULL;
        Manager *m = ASSERT_PTR(userdata);
        const char *x = NULL;
        int r;

        assert(bus);
        assert(reply);

        r = getenv_bool("SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY");
        if (r == -ENXIO) {
                /* EFI case: let's read the LoaderEntryOneShot variable */

                r = efi_loader_update_entry_one_shot_cache(&m->efi_loader_entry_one_shot, &m->efi_loader_entry_one_shot_stat);
                if (r < 0) {
                        if (r != -ENOENT)
                                log_warning_errno(r, "Failed to read LoaderEntryOneShot variable, ignoring: %m");
                } else
                        x = m->efi_loader_entry_one_shot;

        } else if (r < 0)
                log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY: %m");
        else if (r > 0) {

                /* Non-EFI case, let's process /run/systemd/reboot-to-boot-loader-entry. */

                r = read_one_line_file("/run/systemd/reboot-to-boot-loader-entry", &v);
                if (r < 0) {
                        if (r != -ENOENT)
                                log_warning_errno(r, "Failed to read /run/systemd/reboot-to-boot-loader-entry, ignoring: %m");
                } else if (!efi_loader_entry_name_valid(v))
                        log_warning("/run/systemd/reboot-to-boot-loader-entry is not valid, ignoring.");
                else
                        x = v;
        }

        return sd_bus_message_append(reply, "s", x);
}

static int boot_loader_entry_exists(Manager *m, const char *id) {
        _cleanup_(boot_config_free) BootConfig config = BOOT_CONFIG_NULL;
        int r;

        assert(m);
        assert(id);

        r = boot_config_load_auto(&config, NULL, NULL);
        if (r < 0 && r != -ENOKEY) /* don't complain if no GPT is found, hence skip ENOKEY */
                return r;

        r = manager_read_efi_boot_loader_entries(m);
        if (r >= 0)
                (void) boot_config_augment_from_loader(&config, m->efi_boot_loader_entries, /* auto_only= */ true);

        return !!boot_config_find_entry(&config, id);
}

static int method_set_reboot_to_boot_loader_entry(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        Manager *m = ASSERT_PTR(userdata);
        bool use_efi;
        const char *v;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "s", &v);
        if (r < 0)
                return r;

        if (isempty(v))
                v = NULL;
        else if (efi_loader_entry_name_valid(v)) {
                r = boot_loader_entry_exists(m, v);
                if (r < 0)
                        return r;
                if (r == 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Boot loader entry '%s' is not known.", v);
        } else
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Boot loader entry name '%s' is not valid, refusing.", v);

        r = getenv_bool("SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY");
        if (r == -ENXIO) {
                uint64_t features;

                /* EFI case: let's see if booting into boot loader entry is supported. */

                r = efi_loader_get_features(&features);
                if (r < 0)
                        log_warning_errno(r, "Failed to determine whether reboot into boot loader entry is supported: %m");
                if (r < 0 || !FLAGS_SET(features, EFI_LOADER_FEATURE_ENTRY_ONESHOT))
                        return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Loader does not support boot into boot loader entry.");

                use_efi = true;

        } else if (r <= 0) {
                /* non-EFI case: $SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY is set to off */

                if (r < 0)
                        log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY: %m");

                return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Loader does not support boot into boot loader entry.");
        } else
                /* non-EFI case: $SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY is set to on */
                use_efi = false;

        r = bus_verify_polkit_async(message,
                                    CAP_SYS_ADMIN,
                                    "org.freedesktop.login1.set-reboot-to-boot-loader-entry",
                                    NULL,
                                    false,
                                    UID_INVALID,
                                    &m->polkit_registry,
                                    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 */

        if (use_efi) {
                if (isempty(v))
                        /* Delete item */
                        r = efi_set_variable(EFI_LOADER_VARIABLE(LoaderEntryOneShot), NULL, 0);
                else
                        r = efi_set_variable_string(EFI_LOADER_VARIABLE(LoaderEntryOneShot), v);
                if (r < 0)
                        return r;
        } else {
                if (isempty(v)) {
                        if (unlink("/run/systemd/reboot-to-boot-loader-entry") < 0 && errno != ENOENT)
                                return -errno;
                } else {
                        r = write_string_file_atomic_label("/run/systemd/reboot-boot-to-loader-entry", v);
                        if (r < 0)
                                return r;
                }
        }

        return sd_bus_reply_method_return(message, NULL);
}

static int method_can_reboot_to_boot_loader_entry(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        _unused_ Manager *m = ASSERT_PTR(userdata);
        int r;

        assert(message);

        r = getenv_bool("SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY");
        if (r == -ENXIO) {
                uint64_t features = 0;

                /* EFI case, let's see if booting into boot loader entry is supported. */

                r = efi_loader_get_features(&features);
                if (r < 0)
                        log_warning_errno(r, "Failed to determine whether reboot to boot loader entry is supported: %m");
                if (r < 0 || !FLAGS_SET(features, EFI_LOADER_FEATURE_ENTRY_ONESHOT))
                        return sd_bus_reply_method_return(message, "s", "na");

        } else if (r <= 0) {
                /* Non-EFI case: let's trust $SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY */

                if (r < 0)
                        log_warning_errno(r, "Failed to parse $SYSTEMD_REBOOT_TO_BOOT_LOADER_ENTRY: %m");

                return sd_bus_reply_method_return(message, "s", "na");
        }

        return return_test_polkit(
                        message,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.login1.set-reboot-to-boot-loader-entry",
                        NULL,
                        UID_INVALID,
                        error);
}

static int property_get_boot_loader_entries(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        _cleanup_(boot_config_free) BootConfig config = BOOT_CONFIG_NULL;
        Manager *m = ASSERT_PTR(userdata);
        size_t i;
        int r;

        assert(bus);
        assert(reply);

        r = boot_config_load_auto(&config, NULL, NULL);
        if (r < 0 && r != -ENOKEY) /* don't complain if there's no GPT found */
                return r;

        r = manager_read_efi_boot_loader_entries(m);
        if (r >= 0)
                (void) boot_config_augment_from_loader(&config, m->efi_boot_loader_entries, /* auto_only= */ true);

        r = sd_bus_message_open_container(reply, 'a', "s");
        if (r < 0)
                return r;

        for (i = 0; i < config.n_entries; i++) {
                BootEntry *e = config.entries + i;

                r = sd_bus_message_append(reply, "s", e->id);
                if (r < 0)
                        return r;
        }

        return sd_bus_message_close_container(reply);
}

static int method_set_wall_message(
                sd_bus_message *message,
                void *userdata,
                sd_bus_error *error) {

        int r;
        Manager *m = ASSERT_PTR(userdata);
        char *wall_message;
        int enable_wall_messages;

        assert(message);

        r = sd_bus_message_read(message, "sb", &wall_message, &enable_wall_messages);
        if (r < 0)
                return r;

        if (strlen(wall_message) > WALL_MESSAGE_MAX)
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                        "Wall message too long, maximum permitted length is %u characters.",
                        WALL_MESSAGE_MAX);

        /* Short-circuit the operation if the desired state is already in place, to
         * avoid an unnecessary polkit permission check. */
        if (streq_ptr(m->wall_message, empty_to_null(wall_message)) &&
            m->enable_wall_messages == enable_wall_messages)
                goto done;

        r = bus_verify_polkit_async(message,
                                    CAP_SYS_ADMIN,
                                    "org.freedesktop.login1.set-wall-message",
                                    NULL,
                                    false,
                                    UID_INVALID,
                                    &m->polkit_registry,
                                    error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Will call us back */

        r = free_and_strdup(&m->wall_message, empty_to_null(wall_message));
        if (r < 0)
                return log_oom();

        m->enable_wall_messages = enable_wall_messages;

 done:
        return sd_bus_reply_method_return(message, NULL);
}

static int method_inhibit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
        _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
        const char *who, *why, *what, *mode;
        _cleanup_free_ char *id = NULL;
        _cleanup_close_ int fifo_fd = -EBADF;
        Manager *m = ASSERT_PTR(userdata);
        InhibitMode mm;
        InhibitWhat w;
        pid_t pid;
        uid_t uid;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "ssss", &what, &who, &why, &mode);
        if (r < 0)
                return r;

        w = inhibit_what_from_string(what);
        if (w <= 0)
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                         "Invalid what specification %s", what);

        mm = inhibit_mode_from_string(mode);
        if (mm < 0)
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                         "Invalid mode specification %s", mode);

        /* Delay is only supported for shutdown/sleep */
        if (mm == INHIBIT_DELAY && (w & ~(INHIBIT_SHUTDOWN|INHIBIT_SLEEP)))
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                         "Delay inhibitors only supported for shutdown and sleep");

        /* Don't allow taking delay locks while we are already
         * executing the operation. We shouldn't create the impression
         * that the lock was successful if the machine is about to go
         * down/suspend any moment. */
        if (m->delayed_action && m->delayed_action->inhibit_what & w)
                return sd_bus_error_setf(error, BUS_ERROR_OPERATION_IN_PROGRESS,
                                         "The operation inhibition has been requested for is already running");

        r = bus_verify_polkit_async(
                        message,
                        CAP_SYS_BOOT,
                        w == INHIBIT_SHUTDOWN             ? (mm == INHIBIT_BLOCK ? "org.freedesktop.login1.inhibit-block-shutdown" : "org.freedesktop.login1.inhibit-delay-shutdown") :
                        w == INHIBIT_SLEEP                ? (mm == INHIBIT_BLOCK ? "org.freedesktop.login1.inhibit-block-sleep"    : "org.freedesktop.login1.inhibit-delay-sleep") :
                        w == INHIBIT_IDLE                 ? "org.freedesktop.login1.inhibit-block-idle" :
                        w == INHIBIT_HANDLE_POWER_KEY     ? "org.freedesktop.login1.inhibit-handle-power-key" :
                        w == INHIBIT_HANDLE_SUSPEND_KEY   ? "org.freedesktop.login1.inhibit-handle-suspend-key" :
                        w == INHIBIT_HANDLE_REBOOT_KEY    ? "org.freedesktop.login1.inhibit-handle-reboot-key" :
                        w == INHIBIT_HANDLE_HIBERNATE_KEY ? "org.freedesktop.login1.inhibit-handle-hibernate-key" :
                                                            "org.freedesktop.login1.inhibit-handle-lid-switch",
                        NULL,
                        false,
                        UID_INVALID,
                        &m->polkit_registry,
                        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 = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID, &creds);
        if (r < 0)
                return r;

        r = sd_bus_creds_get_euid(creds, &uid);
        if (r < 0)
                return r;

        r = sd_bus_creds_get_pid(creds, &pid);
        if (r < 0)
                return r;

        r = pidref_set_pid(&pidref, pid);
        if (r < 0)
                return sd_bus_error_set_errnof(error, r, "Failed pin source process "PID_FMT": %m", pid);

        if (hashmap_size(m->inhibitors) >= m->inhibitors_max)
                return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED,
                                         "Maximum number of inhibitors (%" PRIu64 ") reached, refusing further inhibitors.",
                                         m->inhibitors_max);

        do {
                id = mfree(id);

                if (asprintf(&id, "%" PRIu64, ++m->inhibit_counter) < 0)
                        return -ENOMEM;

        } while (hashmap_get(m->inhibitors, id));

        _cleanup_(inhibitor_freep) Inhibitor *i = NULL;
        r = manager_add_inhibitor(m, id, &i);
        if (r < 0)
                return r;

        i->what = w;
        i->mode = mm;
        i->pid = TAKE_PIDREF(pidref);
        i->uid = uid;
        i->why = strdup(why);
        i->who = strdup(who);

        if (!i->why || !i->who)
                return -ENOMEM;

        fifo_fd = inhibitor_create_fifo(i);
        if (fifo_fd < 0)
                return fifo_fd;

        r = inhibitor_start(i);
        if (r < 0)
                return r;
        TAKE_PTR(i);

        return sd_bus_reply_method_return(message, "h", fifo_fd);
}

static const sd_bus_vtable manager_vtable[] = {
        SD_BUS_VTABLE_START(0),

        SD_BUS_WRITABLE_PROPERTY("EnableWallMessages", "b", bus_property_get_bool, bus_property_set_bool, offsetof(Manager, enable_wall_messages), 0),
        SD_BUS_WRITABLE_PROPERTY("WallMessage", "s", NULL, NULL, offsetof(Manager, wall_message), 0),

        SD_BUS_PROPERTY("NAutoVTs", "u", NULL, offsetof(Manager, n_autovts), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("KillOnlyUsers", "as", NULL, offsetof(Manager, kill_only_users), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("KillExcludeUsers", "as", NULL, offsetof(Manager, kill_exclude_users), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("KillUserProcesses", "b", bus_property_get_bool, offsetof(Manager, kill_user_processes), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("RebootParameter", "s", property_get_reboot_parameter, 0, 0),
        SD_BUS_PROPERTY("RebootToFirmwareSetup", "b", property_get_reboot_to_firmware_setup, 0, 0),
        SD_BUS_PROPERTY("RebootToBootLoaderMenu", "t", property_get_reboot_to_boot_loader_menu, 0, 0),
        SD_BUS_PROPERTY("RebootToBootLoaderEntry", "s", property_get_reboot_to_boot_loader_entry, 0, 0),
        SD_BUS_PROPERTY("BootLoaderEntries", "as", property_get_boot_loader_entries, 0, SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("BlockInhibited", "s", property_get_inhibited, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("DelayInhibited", "s", property_get_inhibited, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("InhibitDelayMaxUSec", "t", NULL, offsetof(Manager, inhibit_delay_max), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("UserStopDelayUSec", "t", NULL, offsetof(Manager, user_stop_delay), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandlePowerKey", "s", property_get_handle_action, offsetof(Manager, handle_power_key), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandlePowerKeyLongPress", "s", property_get_handle_action, offsetof(Manager, handle_power_key_long_press), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleRebootKey", "s", property_get_handle_action, offsetof(Manager, handle_reboot_key), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleRebootKeyLongPress", "s", property_get_handle_action, offsetof(Manager, handle_reboot_key_long_press), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleSuspendKey", "s", property_get_handle_action, offsetof(Manager, handle_suspend_key), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleSuspendKeyLongPress", "s", property_get_handle_action, offsetof(Manager, handle_suspend_key_long_press), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleHibernateKey", "s", property_get_handle_action, offsetof(Manager, handle_hibernate_key), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleHibernateKeyLongPress", "s", property_get_handle_action, offsetof(Manager, handle_hibernate_key_long_press), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleLidSwitch", "s", property_get_handle_action, offsetof(Manager, handle_lid_switch), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleLidSwitchExternalPower", "s", property_get_handle_action, offsetof(Manager, handle_lid_switch_ep), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HandleLidSwitchDocked", "s", property_get_handle_action, offsetof(Manager, handle_lid_switch_docked), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("HoldoffTimeoutUSec", "t", NULL, offsetof(Manager, holdoff_timeout_usec), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("IdleAction", "s", property_get_handle_action, offsetof(Manager, idle_action), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("IdleActionUSec", "t", NULL, offsetof(Manager, idle_action_usec), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("PreparingForShutdown", "b", property_get_preparing, 0, 0),
        SD_BUS_PROPERTY("PreparingForSleep", "b", property_get_preparing, 0, 0),
        SD_BUS_PROPERTY("ScheduledShutdown", "(st)", property_get_scheduled_shutdown, 0, 0),
        SD_BUS_PROPERTY("Docked", "b", property_get_docked, 0, 0),
        SD_BUS_PROPERTY("LidClosed", "b", property_get_lid_closed, 0, 0),
        SD_BUS_PROPERTY("OnExternalPower", "b", property_get_on_external_power, 0, 0),
        SD_BUS_PROPERTY("RemoveIPC", "b", bus_property_get_bool, offsetof(Manager, remove_ipc), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("RuntimeDirectorySize", "t", NULL, offsetof(Manager, runtime_dir_size), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("RuntimeDirectoryInodesMax", "t", NULL, offsetof(Manager, runtime_dir_inodes), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("InhibitorsMax", "t", NULL, offsetof(Manager, inhibitors_max), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("NCurrentInhibitors", "t", property_get_hashmap_size, offsetof(Manager, inhibitors), 0),
        SD_BUS_PROPERTY("SessionsMax", "t", NULL, offsetof(Manager, sessions_max), SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("NCurrentSessions", "t", property_get_hashmap_size, offsetof(Manager, sessions), 0),
        SD_BUS_PROPERTY("UserTasksMax", "t", property_get_compat_user_tasks_max, 0, SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
        SD_BUS_PROPERTY("StopIdleSessionUSec", "t", NULL, offsetof(Manager, stop_idle_session_usec), SD_BUS_VTABLE_PROPERTY_CONST),

        SD_BUS_METHOD_WITH_ARGS("GetSession",
                                SD_BUS_ARGS("s", session_id),
                                SD_BUS_RESULT("o", object_path),
                                method_get_session,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("GetSessionByPID",
                                SD_BUS_ARGS("u", pid),
                                SD_BUS_RESULT("o", object_path),
                                method_get_session_by_pid,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("GetUser",
                                SD_BUS_ARGS("u", uid),
                                SD_BUS_RESULT("o", object_path),
                                method_get_user,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("GetUserByPID",
                                SD_BUS_ARGS("u", pid),
                                SD_BUS_RESULT("o", object_path),
                                method_get_user_by_pid,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("GetSeat",
                                SD_BUS_ARGS("s", seat_id),
                                SD_BUS_RESULT("o", object_path),
                                method_get_seat,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("ListSessions",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("a(susso)", sessions),
                                method_list_sessions,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("ListUsers",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("a(uso)", users),
                                method_list_users,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("ListSeats",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("a(so)", seats),
                                method_list_seats,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("ListInhibitors",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("a(ssssuu)", inhibitors),
                                method_list_inhibitors,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CreateSession",
                                SD_BUS_ARGS("u", uid,
                                            "u", pid,
                                            "s", service,
                                            "s", type,
                                            "s", class,
                                            "s", desktop,
                                            "s", seat_id,
                                            "u", vtnr,
                                            "s", tty,
                                            "s", display,
                                            "b", remote,
                                            "s", remote_user,
                                            "s", remote_host,
                                            "a(sv)", properties),
                                SD_BUS_RESULT("s", session_id,
                                              "o", object_path,
                                              "s", runtime_path,
                                              "h", fifo_fd,
                                              "u", uid,
                                              "s", seat_id,
                                              "u", vtnr,
                                              "b", existing),
                                method_create_session,
                                0),
        SD_BUS_METHOD_WITH_ARGS("ReleaseSession",
                                SD_BUS_ARGS("s", session_id),
                                SD_BUS_NO_RESULT,
                                method_release_session,
                                0),
        SD_BUS_METHOD_WITH_ARGS("ActivateSession",
                                SD_BUS_ARGS("s", session_id),
                                SD_BUS_NO_RESULT,
                                method_activate_session,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("ActivateSessionOnSeat",
                                SD_BUS_ARGS("s", session_id, "s", seat_id),
                                SD_BUS_NO_RESULT,
                                method_activate_session_on_seat,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("LockSession",
                                SD_BUS_ARGS("s", session_id),
                                SD_BUS_NO_RESULT,
                                method_lock_session,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("UnlockSession",
                                SD_BUS_ARGS("s", session_id),
                                SD_BUS_NO_RESULT,
                                method_lock_session,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("LockSessions",
                      NULL,
                      NULL,
                      method_lock_sessions,
                      SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("UnlockSessions",
                      NULL,
                      NULL,
                      method_lock_sessions,
                      SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("KillSession",
                                SD_BUS_ARGS("s", session_id, "s", who, "i", signal_number),
                                SD_BUS_NO_RESULT,
                                method_kill_session,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("KillUser",
                                SD_BUS_ARGS("u", uid, "i", signal_number),
                                SD_BUS_NO_RESULT,
                                method_kill_user,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("TerminateSession",
                                SD_BUS_ARGS("s", session_id),
                                SD_BUS_NO_RESULT,
                                method_terminate_session,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("TerminateUser",
                                SD_BUS_ARGS("u", uid),
                                SD_BUS_NO_RESULT,
                                method_terminate_user,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("TerminateSeat",
                                SD_BUS_ARGS("s", seat_id),
                                SD_BUS_NO_RESULT,
                                method_terminate_seat,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetUserLinger",
                                SD_BUS_ARGS("u", uid, "b", enable, "b", interactive),
                                SD_BUS_NO_RESULT,
                                method_set_user_linger,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("AttachDevice",
                                SD_BUS_ARGS("s", seat_id, "s", sysfs_path, "b", interactive),
                                SD_BUS_NO_RESULT,
                                method_attach_device,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("FlushDevices",
                                SD_BUS_ARGS("b", interactive),
                                SD_BUS_NO_RESULT,
                                method_flush_devices,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("PowerOff",
                                SD_BUS_ARGS("b", interactive),
                                SD_BUS_NO_RESULT,
                                method_poweroff,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("PowerOffWithFlags",
                                SD_BUS_ARGS("t", flags),
                                SD_BUS_NO_RESULT,
                                method_poweroff,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("Reboot",
                                SD_BUS_ARGS("b", interactive),
                                SD_BUS_NO_RESULT,
                                method_reboot,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("RebootWithFlags",
                                SD_BUS_ARGS("t", flags),
                                SD_BUS_NO_RESULT,
                                method_reboot,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("Halt",
                                SD_BUS_ARGS("b", interactive),
                                SD_BUS_NO_RESULT,
                                method_halt,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("HaltWithFlags",
                                SD_BUS_ARGS("t", flags),
                                SD_BUS_NO_RESULT,
                                method_halt,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("Suspend",
                                SD_BUS_ARGS("b", interactive),
                                SD_BUS_NO_RESULT,
                                method_suspend,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SuspendWithFlags",
                                SD_BUS_ARGS("t", flags),
                                SD_BUS_NO_RESULT,
                                method_suspend,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("Hibernate",
                                SD_BUS_ARGS("b", interactive),
                                SD_BUS_NO_RESULT,
                                method_hibernate,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("HibernateWithFlags",
                                SD_BUS_ARGS("t", flags),
                                SD_BUS_NO_RESULT,
                                method_hibernate,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("HybridSleep",
                                SD_BUS_ARGS("b", interactive),
                                SD_BUS_NO_RESULT,
                                method_hybrid_sleep,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("HybridSleepWithFlags",
                                SD_BUS_ARGS("t", flags),
                                SD_BUS_NO_RESULT,
                                method_hybrid_sleep,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SuspendThenHibernate",
                                SD_BUS_ARGS("b", interactive),
                                SD_BUS_NO_RESULT,
                                method_suspend_then_hibernate,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SuspendThenHibernateWithFlags",
                                SD_BUS_ARGS("t", flags),
                                SD_BUS_NO_RESULT,
                                method_suspend_then_hibernate,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanPowerOff",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_poweroff,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanReboot",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_reboot,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanHalt",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_halt,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanSuspend",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_suspend,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanHibernate",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_hibernate,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanHybridSleep",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_hybrid_sleep,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanSuspendThenHibernate",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_suspend_then_hibernate,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("ScheduleShutdown",
                                SD_BUS_ARGS("s", type, "t", usec),
                                SD_BUS_NO_RESULT,
                                method_schedule_shutdown,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CancelScheduledShutdown",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("b", cancelled),
                                method_cancel_scheduled_shutdown,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("Inhibit",
                                SD_BUS_ARGS("s", what, "s", who, "s", why, "s", mode),
                                SD_BUS_RESULT("h", pipe_fd),
                                method_inhibit,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanRebootParameter",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_reboot_parameter,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetRebootParameter",
                                SD_BUS_ARGS("s", parameter),
                                SD_BUS_NO_RESULT,
                                method_set_reboot_parameter,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanRebootToFirmwareSetup",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_reboot_to_firmware_setup,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetRebootToFirmwareSetup",
                                SD_BUS_ARGS("b", enable),
                                SD_BUS_NO_RESULT,
                                method_set_reboot_to_firmware_setup,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanRebootToBootLoaderMenu",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_reboot_to_boot_loader_menu,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetRebootToBootLoaderMenu",
                                SD_BUS_ARGS("t", timeout),
                                SD_BUS_NO_RESULT,
                                method_set_reboot_to_boot_loader_menu,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("CanRebootToBootLoaderEntry",
                                SD_BUS_NO_ARGS,
                                SD_BUS_RESULT("s", result),
                                method_can_reboot_to_boot_loader_entry,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetRebootToBootLoaderEntry",
                                SD_BUS_ARGS("s", boot_loader_entry),
                                SD_BUS_NO_RESULT,
                                method_set_reboot_to_boot_loader_entry,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetWallMessage",
                                SD_BUS_ARGS("s", wall_message, "b", enable),
                                SD_BUS_NO_RESULT,
                                method_set_wall_message,
                                SD_BUS_VTABLE_UNPRIVILEGED),

        SD_BUS_SIGNAL_WITH_ARGS("SessionNew",
                                SD_BUS_ARGS("s", session_id, "o", object_path),
                                0),
        SD_BUS_SIGNAL_WITH_ARGS("SessionRemoved",
                                SD_BUS_ARGS("s", session_id, "o", object_path),
                                0),
        SD_BUS_SIGNAL_WITH_ARGS("UserNew",
                                SD_BUS_ARGS("u", uid, "o", object_path),
                                0),
        SD_BUS_SIGNAL_WITH_ARGS("UserRemoved",
                                SD_BUS_ARGS("u", uid, "o", object_path),
                                0),
        SD_BUS_SIGNAL_WITH_ARGS("SeatNew",
                                SD_BUS_ARGS("s", seat_id, "o", object_path),
                                0),
        SD_BUS_SIGNAL_WITH_ARGS("SeatRemoved",
                                SD_BUS_ARGS("s", seat_id, "o", object_path),
                                0),
        SD_BUS_SIGNAL_WITH_ARGS("PrepareForShutdown",
                                SD_BUS_ARGS("b", start),
                                0),
        SD_BUS_SIGNAL_WITH_ARGS("PrepareForShutdownWithMetadata",
                                SD_BUS_ARGS("b", start, "a{sv}", metadata),
                                0),
        SD_BUS_SIGNAL_WITH_ARGS("PrepareForSleep",
                                SD_BUS_ARGS("b", start),
                                0),

        SD_BUS_VTABLE_END
};

const BusObjectImplementation manager_object = {
        "/org/freedesktop/login1",
        "org.freedesktop.login1.Manager",
        .vtables = BUS_VTABLES(manager_vtable),
        .children = BUS_IMPLEMENTATIONS(&seat_object,
                                        &session_object,
                                        &user_object),
};

static int session_jobs_reply(Session *s, uint32_t jid, const char *unit, const char *result) {
        assert(s);
        assert(unit);

        if (!s->started)
                return 0;

        if (result && !streq(result, "done")) {
                _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;

                sd_bus_error_setf(&e, BUS_ERROR_JOB_FAILED,
                                  "Job %u for unit '%s' failed with '%s'", jid, unit, result);
                return session_send_create_reply(s, &e);
        }

        return session_send_create_reply(s, NULL);
}

int match_job_removed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        const char *path, *result, *unit;
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        uint32_t id;
        User *user;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "uoss", &id, &path, &unit, &result);
        if (r < 0) {
                bus_log_parse_error(r);
                return 0;
        }

        if (m->action_job && streq(m->action_job, path)) {
                assert(m->delayed_action);
                log_info("Operation '%s' finished.", inhibit_what_to_string(m->delayed_action->inhibit_what));

                /* Tell people that they now may take a lock again */
                (void) send_prepare_for(m, m->delayed_action, false);

                m->action_job = mfree(m->action_job);
                m->delayed_action = NULL;
                return 0;
        }

        session = hashmap_get(m->session_units, unit);
        if (session) {
                if (streq_ptr(path, session->scope_job)) {
                        session->scope_job = mfree(session->scope_job);
                        (void) session_jobs_reply(session, id, unit, result);

                        session_save(session);
                        user_save(session->user);
                }

                session_add_to_gc_queue(session);
        }

        user = hashmap_get(m->user_units, unit);
        if (user) {
                if (streq_ptr(path, user->service_job)) {
                        user->service_job = mfree(user->service_job);

                        LIST_FOREACH(sessions_by_user, s, user->sessions)
                                (void) session_jobs_reply(s, id, unit, NULL /* don't propagate user service failures to the client */);

                        user_save(user);
                }

                user_add_to_gc_queue(user);
        }

        return 0;
}

int match_unit_removed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        const char *path, *unit;
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        User *user;
        int r;

        assert(message);

        r = sd_bus_message_read(message, "so", &unit, &path);
        if (r < 0) {
                bus_log_parse_error(r);
                return 0;
        }

        session = hashmap_get(m->session_units, unit);
        if (session)
                session_add_to_gc_queue(session);

        user = hashmap_get(m->user_units, unit);
        if (user)
                user_add_to_gc_queue(user);

        return 0;
}

int match_properties_changed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_free_ char *unit = NULL;
        Manager *m = ASSERT_PTR(userdata);
        const char *path;
        Session *session;
        User *user;
        int r;

        assert(message);

        path = sd_bus_message_get_path(message);
        if (!path)
                return 0;

        r = unit_name_from_dbus_path(path, &unit);
        if (r == -EINVAL) /* not a unit */
                return 0;
        if (r < 0) {
                log_oom();
                return 0;
        }

        session = hashmap_get(m->session_units, unit);
        if (session)
                session_add_to_gc_queue(session);

        user = hashmap_get(m->user_units, unit);
        if (user)
                user_add_to_gc_queue(user);

        return 0;
}

int match_reloading(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Manager *m = ASSERT_PTR(userdata);
        Session *session;
        int b, r;

        assert(message);

        r = sd_bus_message_read(message, "b", &b);
        if (r < 0) {
                bus_log_parse_error(r);
                return 0;
        }

        if (b)
                return 0;

        /* systemd finished reloading, let's recheck all our sessions */
        log_debug("System manager has been reloaded, rechecking sessions...");

        HASHMAP_FOREACH(session, m->sessions)
                session_add_to_gc_queue(session);

        return 0;
}

int manager_send_changed(Manager *manager, const char *property, ...) {
        char **l;

        assert(manager);

        l = strv_from_stdarg_alloca(property);

        return sd_bus_emit_properties_changed_strv(
                        manager->bus,
                        "/org/freedesktop/login1",
                        "org.freedesktop.login1.Manager",
                        l);
}

static int strdup_job(sd_bus_message *reply, char **job) {
        const char *j;
        char *copy;
        int r;

        r = sd_bus_message_read(reply, "o", &j);
        if (r < 0)
                return r;

        copy = strdup(j);
        if (!copy)
                return -ENOMEM;

        *job = copy;
        return 1;
}

int manager_start_scope(
                Manager *manager,
                const char *scope,
                pid_t pid,
                const char *slice,
                const char *description,
                char **wants,
                char **after,
                const char *requires_mounts_for,
                sd_bus_message *more_properties,
                sd_bus_error *error,
                char **job) {

        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
        int r;

        assert(manager);
        assert(scope);
        assert(pid > 1);
        assert(job);

        r = bus_message_new_method_call(manager->bus, &m, bus_systemd_mgr, "StartTransientUnit");
        if (r < 0)
                return r;

        r = sd_bus_message_append(m, "ss", strempty(scope), "fail");
        if (r < 0)
                return r;

        r = sd_bus_message_open_container(m, 'a', "(sv)");
        if (r < 0)
                return r;

        if (!isempty(slice)) {
                r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);
                if (r < 0)
                        return r;
        }

        if (!isempty(description)) {
                r = sd_bus_message_append(m, "(sv)", "Description", "s", description);
                if (r < 0)
                        return r;
        }

        STRV_FOREACH(i, wants) {
                r = sd_bus_message_append(m, "(sv)", "Wants", "as", 1, *i);
                if (r < 0)
                        return r;
        }

        STRV_FOREACH(i, after) {
                r = sd_bus_message_append(m, "(sv)", "After", "as", 1, *i);
                if (r < 0)
                        return r;
        }

        if (!empty_or_root(requires_mounts_for)) {
                r = sd_bus_message_append(m, "(sv)", "RequiresMountsFor", "as", 1, requires_mounts_for);
                if (r < 0)
                        return r;
        }

        /* Make sure that the session shells are terminated with SIGHUP since bash and friends tend to ignore
         * SIGTERM */
        r = sd_bus_message_append(m, "(sv)", "SendSIGHUP", "b", true);
        if (r < 0)
                return r;

        r = sd_bus_message_append(m, "(sv)", "PIDs", "au", 1, pid);
        if (r < 0)
                return r;

        /* For login session scopes, if a process is OOM killed by the kernel, *don't* terminate the rest of
           the scope */
        r = sd_bus_message_append(m, "(sv)", "OOMPolicy", "s", "continue");
        if (r < 0)
                return r;

        /* disable TasksMax= for the session scope, rely on the slice setting for it */
        r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", UINT64_MAX);
        if (r < 0)
                return bus_log_create_error(r);

        if (more_properties) {
                /* If TasksMax also appears here, it will overwrite the default value set above */
                r = sd_bus_message_copy(m, more_properties, true);
                if (r < 0)
                        return r;
        }

        r = sd_bus_message_close_container(m);
        if (r < 0)
                return r;

        r = sd_bus_message_append(m, "a(sa(sv))", 0);
        if (r < 0)
                return r;

        r = sd_bus_call(manager->bus, m, 0, error, &reply);
        if (r < 0)
                return r;

        return strdup_job(reply, job);
}

int manager_start_unit(Manager *manager, const char *unit, sd_bus_error *error, char **job) {
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        int r;

        assert(manager);
        assert(unit);
        assert(job);

        r = bus_call_method(
                        manager->bus,
                        bus_systemd_mgr,
                        "StartUnit",
                        error,
                        &reply,
                        "ss", unit, "replace");
        if (r < 0)
                return r;

        return strdup_job(reply, job);
}

int manager_stop_unit(Manager *manager, const char *unit, const char *job_mode, sd_bus_error *error, char **ret_job) {
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        int r;

        assert(manager);
        assert(unit);
        assert(ret_job);

        r = bus_call_method(
                        manager->bus,
                        bus_systemd_mgr,
                        "StopUnit",
                        error,
                        &reply,
                        "ss", unit, job_mode ?: "fail");
        if (r < 0) {
                if (sd_bus_error_has_names(error, BUS_ERROR_NO_SUCH_UNIT,
                                                  BUS_ERROR_LOAD_FAILED)) {

                        *ret_job = NULL;
                        sd_bus_error_free(error);
                        return 0;
                }

                return r;
        }

        return strdup_job(reply, ret_job);
}

int manager_abandon_scope(Manager *manager, const char *scope, sd_bus_error *ret_error) {
        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
        _cleanup_free_ char *path = NULL;
        int r;

        assert(manager);
        assert(scope);

        path = unit_dbus_path_from_name(scope);
        if (!path)
                return -ENOMEM;

        r = sd_bus_call_method(
                        manager->bus,
                        "org.freedesktop.systemd1",
                        path,
                        "org.freedesktop.systemd1.Scope",
                        "Abandon",
                        &error,
                        NULL,
                        NULL);
        if (r < 0) {
                if (sd_bus_error_has_names(&error, BUS_ERROR_NO_SUCH_UNIT,
                                                   BUS_ERROR_LOAD_FAILED,
                                                   BUS_ERROR_SCOPE_NOT_RUNNING))
                        return 0;

                sd_bus_error_move(ret_error, &error);
                return r;
        }

        return 1;
}

int manager_kill_unit(Manager *manager, const char *unit, KillWho who, int signo, sd_bus_error *error) {
        assert(manager);
        assert(unit);

        return bus_call_method(
                        manager->bus,
                        bus_systemd_mgr,
                        "KillUnit",
                        error,
                        NULL,
                        "ssi", unit, who == KILL_LEADER ? "main" : "all", signo);
}

int manager_unit_is_active(Manager *manager, const char *unit, sd_bus_error *ret_error) {
        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        _cleanup_free_ char *path = NULL;
        const char *state;
        int r;

        assert(manager);
        assert(unit);

        path = unit_dbus_path_from_name(unit);
        if (!path)
                return -ENOMEM;

        r = sd_bus_get_property(
                        manager->bus,
                        "org.freedesktop.systemd1",
                        path,
                        "org.freedesktop.systemd1.Unit",
                        "ActiveState",
                        &error,
                        &reply,
                        "s");
        if (r < 0) {
                /* systemd might have dropped off momentarily, let's
                 * not make this an error */
                if (sd_bus_error_has_names(&error, SD_BUS_ERROR_NO_REPLY,
                                                   SD_BUS_ERROR_DISCONNECTED))
                        return true;

                /* If the unit is already unloaded then it's not
                 * active */
                if (sd_bus_error_has_names(&error, BUS_ERROR_NO_SUCH_UNIT,
                                                   BUS_ERROR_LOAD_FAILED))
                        return false;

                sd_bus_error_move(ret_error, &error);
                return r;
        }

        r = sd_bus_message_read(reply, "s", &state);
        if (r < 0)
                return r;

        return !STR_IN_SET(state, "inactive", "failed");
}

int manager_job_is_active(Manager *manager, const char *path, sd_bus_error *ret_error) {
        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
        int r;

        assert(manager);
        assert(path);

        r = sd_bus_get_property(
                        manager->bus,
                        "org.freedesktop.systemd1",
                        path,
                        "org.freedesktop.systemd1.Job",
                        "State",
                        &error,
                        &reply,
                        "s");
        if (r < 0) {
                if (sd_bus_error_has_names(&error, SD_BUS_ERROR_NO_REPLY,
                                                   SD_BUS_ERROR_DISCONNECTED))
                        return true;

                if (sd_bus_error_has_name(&error, SD_BUS_ERROR_UNKNOWN_OBJECT))
                        return false;

                sd_bus_error_move(ret_error, &error);
                return r;
        }

        /* We don't actually care about the state really. The fact
         * that we could read the job state is enough for us */

        return true;
}