logind: move logind into its own subdirectory

1 files changed, 1504 insertions, 0 deletions

diff --git a/src/login/logind-dbus.c b/src/login/logind-dbus.c
new file mode 100644
index 0000000000..0550d1bd1c
--- /dev/null
+++ b/src/login/logind-dbus.c
@@ -0,0 +1,1504 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <pwd.h>
+
+#include "logind.h"
+#include "dbus-common.h"
+#include "strv.h"
+#include "polkit.h"
+#include "special.h"
+
+#define BUS_MANAGER_INTERFACE                                           \
+        " <interface name=\"org.freedesktop.login1.Manager\">\n"        \
+        "  <method name=\"GetSession\">\n"                              \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
+        "  </method>\n"                                                 \
+        "  <method name=\"GetUser\">\n"                                 \
+        "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
+        "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
+        "  </method>\n"                                                 \
+        "  <method name=\"GetSeat\">\n"                                 \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
+        "  </method>\n"                                                 \
+        "  <method name=\"ListSessions\">\n"                            \
+        "   <arg name=\"sessions\" type=\"a(susso)\" direction=\"out\"/>\n" \
+        "  </method>\n"                                                 \
+        "  <method name=\"ListUsers\">\n"                               \
+        "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
+        "  </method>\n"                                                 \
+        "  <method name=\"ListSeats\">\n"                               \
+        "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
+        "  </method>\n"                                                 \
+        "  <method name=\"CreateSession\">\n"                           \
+        "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
+        "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
+        "   <arg name=\"sevice\" type=\"s\" direction=\"in\"/>\n"       \
+        "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
+        "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
+        "   <arg name=\"vtnr\" type=\"u\" direction=\"in\"/>\n"         \
+        "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
+        "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
+        "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
+        "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
+        "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
+        "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
+        "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
+        "   <arg name=\"kill_processes\" type=\"b\" direction=\"in\"/>\n" \
+        "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
+        "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
+        "   <arg name=\"runtime_path\" type=\"o\" direction=\"out\"/>\n" \
+        "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
+        "   <arg name=\"seat\" type=\"s\" direction=\"out\"/>\n"        \
+        "   <arg name=\"vtnr\" type=\"u\" direction=\"out\"/>\n"        \
+        "  </method>\n"                                                 \
+        "  <method name=\"ActivateSession\">\n"                         \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "  </method>\n"                                                 \
+        "  <method name=\"LockSession\">\n"                             \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "  </method>\n"                                                 \
+        "  <method name=\"UnlockSession\">\n"                           \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "  </method>\n"                                                 \
+        "  <method name=\"KillSession\">\n"                             \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "   <arg name=\"who\" type=\"s\"/>\n"                           \
+        "   <arg name=\"signal\" type=\"s\"/>\n"                        \
+        "  </method>\n"                                                 \
+        "  <method name=\"KillUser\">\n"                                \
+        "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
+        "   <arg name=\"signal\" type=\"s\"/>\n"                        \
+        "  </method>\n"                                                 \
+        "  <method name=\"TerminateSession\">\n"                        \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "  </method>\n"                                                 \
+        "  <method name=\"TerminateUser\">\n"                           \
+        "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
+        "  </method>\n"                                                 \
+        "  <method name=\"TerminateSeat\">\n"                           \
+        "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
+        "  </method>\n"                                                 \
+        "  <method name=\"SetUserLinger\">\n"                           \
+        "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
+        "   <arg name=\"b\" type=\"b\" direction=\"in\"/>\n"            \
+        "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
+        "  </method>\n"                                                 \
+        "  <method name=\"AttachDevice\">\n"                            \
+        "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
+        "   <arg name=\"sysfs\" type=\"s\" direction=\"in\"/>\n"        \
+        "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
+        "  </method>\n"                                                 \
+        "  <method name=\"FlushDevices\">\n"                            \
+        "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
+        "  </method>\n"                                                 \
+        "  <method name=\"PowerOff\">\n"                                \
+        "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
+        "  </method>\n"                                                 \
+        "  <method name=\"Reboot\">\n"                                  \
+        "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
+        "  </method>\n"                                                 \
+        "  <signal name=\"SessionNew\">\n"                              \
+        "   <arg name=\"id\" type=\"s\"/>\n"                            \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"SessionRemoved\">\n"                          \
+        "   <arg name=\"id\" type=\"s\"/>\n"                            \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"UserNew\">\n"                                 \
+        "   <arg name=\"uid\" type=\"u\"/>\n"                           \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"UserRemoved\">\n"                             \
+        "   <arg name=\"uid\" type=\"u\"/>\n"                           \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"SeatNew\">\n"                                 \
+        "   <arg name=\"id\" type=\"s\"/>\n"                            \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"SeatRemoved\">\n"                             \
+        "   <arg name=\"id\" type=\"s\"/>\n"                            \
+        "   <arg name=\"path\" type=\"o\"/>\n"                          \
+        "  </signal>\n"                                                 \
+        "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
+        "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
+        "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
+        "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
+        "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
+        "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
+        "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
+        " </interface>\n"
+
+#define INTROSPECTION_BEGIN                                             \
+        DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
+        "<node>\n"                                                      \
+        BUS_MANAGER_INTERFACE                                           \
+        BUS_PROPERTIES_INTERFACE                                        \
+        BUS_PEER_INTERFACE                                              \
+        BUS_INTROSPECTABLE_INTERFACE
+
+#define INTROSPECTION_END                                               \
+        "</node>\n"
+
+#define INTERFACES_LIST                              \
+        BUS_GENERIC_INTERFACES_LIST                  \
+        "org.freedesktop.login1.Manager\0"
+
+static int bus_manager_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
+        Manager *m = data;
+        dbus_bool_t b;
+
+        assert(i);
+        assert(property);
+        assert(m);
+
+        b = manager_get_idle_hint(m, NULL) > 0;
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int bus_manager_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
+        Manager *m = data;
+        dual_timestamp t;
+        uint64_t u;
+
+        assert(i);
+        assert(property);
+        assert(m);
+
+        manager_get_idle_hint(m, &t);
+        u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
+
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMessage **_reply) {
+        Session *session = NULL;
+        User *user = NULL;
+        const char *type, *seat, *tty, *display, *remote_user, *remote_host, *service;
+        uint32_t uid, leader, audit_id = 0;
+        dbus_bool_t remote, kill_processes;
+        char **controllers = NULL, **reset_controllers = NULL;
+        SessionType t;
+        Seat *s;
+        DBusMessageIter iter;
+        int r;
+        char *id = NULL, *p;
+        uint32_t vtnr = 0;
+        int fifo_fd = -1;
+        DBusMessage *reply = NULL;
+        bool b;
+
+        assert(m);
+        assert(message);
+        assert(_reply);
+
+        if (!dbus_message_iter_init(message, &iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &uid);
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &leader);
+
+        if (leader <= 0 ||
+            !dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &service);
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &type);
+        t = session_type_from_string(type);
+
+        if (t < 0 ||
+            !dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &seat);
+
+        if (isempty(seat))
+                s = NULL;
+        else {
+                s = hashmap_get(m->seats, seat);
+                if (!s)
+                        return -ENOENT;
+        }
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &vtnr);
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &tty);
+
+        if (tty_is_vc(tty)) {
+                int v;
+
+                if (!s)
+                        s = m->vtconsole;
+                else if (s != m->vtconsole)
+                        return -EINVAL;
+
+                v = vtnr_from_tty(tty);
+
+                if (v <= 0)
+                        return v < 0 ? v : -EINVAL;
+
+                if (vtnr <= 0)
+                        vtnr = (uint32_t) v;
+                else if (vtnr != (uint32_t) v)
+                        return -EINVAL;
+
+        } else if (!isempty(tty) && s && seat_is_vtconsole(s))
+                return -EINVAL;
+
+        if (s) {
+                if (seat_is_vtconsole(s)) {
+                        if (vtnr <= 0 || vtnr > 63)
+                                return -EINVAL;
+                } else {
+                        if (vtnr > 0)
+                                return -EINVAL;
+                }
+        }
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &display);
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &remote);
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &remote_user);
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+                return -EINVAL;
+
+        dbus_message_iter_get_basic(&iter, &remote_host);
+
+        if (!dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
+            dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
+                return -EINVAL;
+
+        r = bus_parse_strv_iter(&iter, &controllers);
+        if (r < 0)
+                return -EINVAL;
+
+        if (strv_contains(controllers, "systemd") ||
+            !dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
+            dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING) {
+                r = -EINVAL;
+                goto fail;
+        }
+
+        r = bus_parse_strv_iter(&iter, &reset_controllers);
+        if (r < 0)
+                goto fail;
+
+        if (strv_contains(reset_controllers, "systemd") ||
+            !dbus_message_iter_next(&iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN) {
+                r = -EINVAL;
+                goto fail;
+        }
+
+        dbus_message_iter_get_basic(&iter, &kill_processes);
+
+        r = manager_add_user_by_uid(m, uid, &user);
+        if (r < 0)
+                goto fail;
+
+        audit_session_from_pid(leader, &audit_id);
+
+        if (audit_id > 0) {
+                asprintf(&id, "%lu", (unsigned long) audit_id);
+
+                if (!id) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+
+                session = hashmap_get(m->sessions, id);
+
+                if (session) {
+                        free(id);
+
+                        fifo_fd = session_create_fifo(session);
+                        if (fifo_fd < 0) {
+                                r = fifo_fd;
+                                goto fail;
+                        }
+
+                        /* Session already exists, client is probably
+                         * something like "su" which changes uid but
+                         * is still the same audit session */
+
+                        reply = dbus_message_new_method_return(message);
+                        if (!reply) {
+                                r = -ENOMEM;
+                                goto fail;
+                        }
+
+                        p = session_bus_path(session);
+                        if (!p) {
+                                r = -ENOMEM;
+                                goto fail;
+                        }
+
+                        seat = session->seat ? session->seat->id : "";
+                        vtnr = session->vtnr;
+                        b = dbus_message_append_args(
+                                        reply,
+                                        DBUS_TYPE_STRING, &session->id,
+                                        DBUS_TYPE_OBJECT_PATH, &p,
+                                        DBUS_TYPE_STRING, &session->user->runtime_path,
+                                        DBUS_TYPE_UNIX_FD, &fifo_fd,
+                                        DBUS_TYPE_STRING, &seat,
+                                        DBUS_TYPE_UINT32, &vtnr,
+                                        DBUS_TYPE_INVALID);
+                        free(p);
+
+                        if (!b) {
+                                r = -ENOMEM;
+                                goto fail;
+                        }
+
+                        close_nointr_nofail(fifo_fd);
+                        *_reply = reply;
+
+                        strv_free(controllers);
+                        strv_free(reset_controllers);
+
+                        return 0;
+                }
+
+        } else {
+                do {
+                        free(id);
+                        asprintf(&id, "c%lu", ++m->session_counter);
+
+                        if (!id) {
+                                r = -ENOMEM;
+                                goto fail;
+                        }
+
+                } while (hashmap_get(m->sessions, id));
+        }
+
+        r = manager_add_session(m, user, id, &session);
+        free(id);
+        if (r < 0)
+                goto fail;
+
+        session->leader = leader;
+        session->audit_id = audit_id;
+        session->type = t;
+        session->remote = remote;
+        session->controllers = controllers;
+        session->reset_controllers = reset_controllers;
+        session->kill_processes = kill_processes;
+        session->vtnr = vtnr;
+
+        controllers = reset_controllers = NULL;
+
+        if (!isempty(tty)) {
+                session->tty = strdup(tty);
+                if (!session->tty) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+        }
+
+        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;
+                }
+        }
+
+        fifo_fd = session_create_fifo(session);
+        if (fifo_fd < 0) {
+                r = fifo_fd;
+                goto fail;
+        }
+
+        if (s) {
+                r = seat_attach_session(s, session);
+                if (r < 0)
+                        goto fail;
+        }
+
+        r = session_start(session);
+        if (r < 0)
+                goto fail;
+
+        reply = dbus_message_new_method_return(message);
+        if (!reply) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        p = session_bus_path(session);
+        if (!p) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        seat = s ? s->id : "";
+        b = dbus_message_append_args(
+                        reply,
+                        DBUS_TYPE_STRING, &session->id,
+                        DBUS_TYPE_OBJECT_PATH, &p,
+                        DBUS_TYPE_STRING, &session->user->runtime_path,
+                        DBUS_TYPE_UNIX_FD, &fifo_fd,
+                        DBUS_TYPE_STRING, &seat,
+                        DBUS_TYPE_UINT32, &vtnr,
+                        DBUS_TYPE_INVALID);
+        free(p);
+
+        if (!b) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        close_nointr_nofail(fifo_fd);
+        *_reply = reply;
+
+        return 0;
+
+fail:
+        strv_free(controllers);
+        strv_free(reset_controllers);
+
+        if (session)
+                session_add_to_gc_queue(session);
+
+        if (user)
+                user_add_to_gc_queue(user);
+
+        if (fifo_fd >= 0)
+                close_nointr_nofail(fifo_fd);
+
+        if (reply)
+                dbus_message_unref(reply);
+
+        return r;
+}
+
+static int trigger_device(Manager *m, struct udev_device *d) {
+        struct udev_enumerate *e;
+        struct udev_list_entry *first, *item;
+        int r;
+
+        assert(m);
+
+        e = udev_enumerate_new(m->udev);
+        if (!e) {
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        if (d) {
+                if (udev_enumerate_add_match_parent(e, d) < 0) {
+                        r = -EIO;
+                        goto finish;
+                }
+        }
+
+        if (udev_enumerate_scan_devices(e) < 0) {
+                r = -EIO;
+                goto finish;
+        }
+
+        first = udev_enumerate_get_list_entry(e);
+        udev_list_entry_foreach(item, first) {
+                char *t;
+                const char *p;
+
+                p = udev_list_entry_get_name(item);
+
+                t = strappend(p, "/uevent");
+                if (!t) {
+                        r = -ENOMEM;
+                        goto finish;
+                }
+
+                write_one_line_file(t, "change");
+                free(t);
+        }
+
+        r = 0;
+
+finish:
+        if (e)
+                udev_enumerate_unref(e);
+
+        return r;
+}
+
+static int attach_device(Manager *m, const char *seat, const char *sysfs) {
+        struct udev_device *d;
+        char *rule = NULL, *file = NULL;
+        const char *id_for_seat;
+        int r;
+
+        assert(m);
+        assert(seat);
+        assert(sysfs);
+
+        d = udev_device_new_from_syspath(m->udev, sysfs);
+        if (!d)
+                return -ENODEV;
+
+        if (!udev_device_has_tag(d, "seat")) {
+                r = -ENODEV;
+                goto finish;
+        }
+
+        id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
+        if (!id_for_seat) {
+                r = -ENODEV;
+                goto finish;
+        }
+
+        if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        mkdir_p("/etc/udev/rules.d", 0755);
+        r = write_one_line_file_atomic(file, rule);
+        if (r < 0)
+                goto finish;
+
+        r = trigger_device(m, d);
+
+finish:
+        free(rule);
+        free(file);
+
+        if (d)
+                udev_device_unref(d);
+
+        return r;
+}
+
+static int flush_devices(Manager *m) {
+        DIR *d;
+
+        assert(m);
+
+        d = opendir("/etc/udev/rules.d");
+        if (!d) {
+                if (errno != ENOENT)
+                        log_warning("Failed to open /etc/udev/rules.d: %m");
+        } else {
+                struct dirent *de;
+
+                while ((de = readdir(d))) {
+
+                        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("Failed to unlink %s: %m", de->d_name);
+                }
+
+                closedir(d);
+        }
+
+        return trigger_device(m, NULL);
+}
+
+static DBusHandlerResult manager_message_handler(
+                DBusConnection *connection,
+                DBusMessage *message,
+                void *userdata) {
+
+        Manager *m = userdata;
+
+        const BusProperty properties[] = {
+                { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
+                { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
+                { "org.freedesktop.login1.Manager", "ResetControllers",       bus_property_append_strv,     "as", m->reset_controllers    },
+                { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
+                { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
+                { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
+                { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
+                { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
+                { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
+                { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
+                { NULL, NULL, NULL, NULL, NULL }
+        };
+
+        DBusError error;
+        DBusMessage *reply = NULL;
+        int r;
+
+        assert(connection);
+        assert(message);
+        assert(m);
+
+        dbus_error_init(&error);
+
+        if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
+                const char *name;
+                char *p;
+                Session *session;
+                bool b;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_STRING, &name,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                session = hashmap_get(m->sessions, name);
+                if (!session)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+                p = session_bus_path(session);
+                if (!p)
+                        goto oom;
+
+                b = dbus_message_append_args(
+                                reply,
+                                DBUS_TYPE_OBJECT_PATH, &p,
+                                DBUS_TYPE_INVALID);
+                free(p);
+
+                if (!b)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
+                uint32_t uid;
+                char *p;
+                User *user;
+                bool b;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_UINT32, &uid,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
+                if (!user)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+                p = user_bus_path(user);
+                if (!p)
+                        goto oom;
+
+                b = dbus_message_append_args(
+                                reply,
+                                DBUS_TYPE_OBJECT_PATH, &p,
+                                DBUS_TYPE_INVALID);
+                free(p);
+
+                if (!b)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
+                const char *name;
+                char *p;
+                Seat *seat;
+                bool b;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_STRING, &name,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                seat = hashmap_get(m->seats, name);
+                if (!seat)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+                p = seat_bus_path(seat);
+                if (!p)
+                        goto oom;
+
+                b = dbus_message_append_args(
+                                reply,
+                                DBUS_TYPE_OBJECT_PATH, &p,
+                                DBUS_TYPE_INVALID);
+                free(p);
+
+                if (!b)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
+                char *p;
+                Session *session;
+                Iterator i;
+                DBusMessageIter iter, sub;
+                const char *empty = "";
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+                dbus_message_iter_init_append(reply, &iter);
+
+                if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
+                        goto oom;
+
+                HASHMAP_FOREACH(session, m->sessions, i) {
+                        DBusMessageIter sub2;
+                        uint32_t uid;
+
+                        if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
+                                goto oom;
+
+                        uid = session->user->uid;
+
+                        p = session_bus_path(session);
+                        if (!p)
+                                goto oom;
+
+                        if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
+                            !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
+                            !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
+                            !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
+                            !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
+                                free(p);
+                                goto oom;
+                        }
+
+                        free(p);
+
+                        if (!dbus_message_iter_close_container(&sub, &sub2))
+                                goto oom;
+                }
+
+                if (!dbus_message_iter_close_container(&iter, &sub))
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
+                char *p;
+                User *user;
+                Iterator i;
+                DBusMessageIter iter, sub;
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+                dbus_message_iter_init_append(reply, &iter);
+
+                if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
+                        goto oom;
+
+                HASHMAP_FOREACH(user, m->users, i) {
+                        DBusMessageIter sub2;
+                        uint32_t uid;
+
+                        if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
+                                goto oom;
+
+                        uid = user->uid;
+
+                        p = user_bus_path(user);
+                        if (!p)
+                                goto oom;
+
+                        if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
+                            !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
+                            !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
+                                free(p);
+                                goto oom;
+                        }
+
+                        free(p);
+
+                        if (!dbus_message_iter_close_container(&sub, &sub2))
+                                goto oom;
+                }
+
+                if (!dbus_message_iter_close_container(&iter, &sub))
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
+                char *p;
+                Seat *seat;
+                Iterator i;
+                DBusMessageIter iter, sub;
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+                dbus_message_iter_init_append(reply, &iter);
+
+                if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
+                        goto oom;
+
+                HASHMAP_FOREACH(seat, m->seats, i) {
+                        DBusMessageIter sub2;
+
+                        if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
+                                goto oom;
+
+                        p = seat_bus_path(seat);
+                        if (!p)
+                                goto oom;
+
+                        if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
+                            !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
+                                free(p);
+                                goto oom;
+                        }
+
+                        free(p);
+
+                        if (!dbus_message_iter_close_container(&sub, &sub2))
+                                goto oom;
+                }
+
+                if (!dbus_message_iter_close_container(&iter, &sub))
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
+
+                r = bus_manager_create_session(m, message, &reply);
+
+                /* Don't delay the work on OOM here, since it might be
+                 * triggered by a low RLIMIT_NOFILE here (since we
+                 * send a dupped fd to the client), and we'd rather
+                 * see this fail quickly then be retried later */
+
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, &error, r);
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
+                const char *name;
+                Session *session;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_STRING, &name,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                session = hashmap_get(m->sessions, name);
+                if (!session)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                r = session_activate(session);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, NULL, r);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "LockSession") ||
+                   dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "UnlockSession")) {
+                const char *name;
+                Session *session;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_STRING, &name,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                session = hashmap_get(m->sessions, name);
+                if (!session)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                if (session_send_lock(session, streq(dbus_message_get_member(message), "LockSession")) < 0)
+                        goto oom;
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillSession")) {
+                const char *swho;
+                int32_t signo;
+                KillWho who;
+                const char *name;
+                Session *session;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_STRING, &name,
+                                    DBUS_TYPE_STRING, &swho,
+                                    DBUS_TYPE_INT32, &signo,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                if (isempty(swho))
+                        who = KILL_ALL;
+                else {
+                        who = kill_who_from_string(swho);
+                        if (who < 0)
+                                return bus_send_error_reply(connection, message, &error, -EINVAL);
+                }
+
+                if (signo <= 0 || signo >= _NSIG)
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                session = hashmap_get(m->sessions, name);
+                if (!session)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                r = session_kill(session, who, signo);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, NULL, r);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillUser")) {
+                uint32_t uid;
+                User *user;
+                int32_t signo;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_UINT32, &uid,
+                                    DBUS_TYPE_INT32, &signo,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                if (signo <= 0 || signo >= _NSIG)
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
+                if (!user)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                r = user_kill(user, signo);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, NULL, r);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
+                const char *name;
+                Session *session;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_STRING, &name,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                session = hashmap_get(m->sessions, name);
+                if (!session)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                r = session_stop(session);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, NULL, r);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
+                uint32_t uid;
+                User *user;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_UINT32, &uid,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
+                if (!user)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                r = user_stop(user);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, NULL, r);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
+                const char *name;
+                Seat *seat;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_STRING, &name,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                seat = hashmap_get(m->seats, name);
+                if (!seat)
+                        return bus_send_error_reply(connection, message, &error, -ENOENT);
+
+                r = seat_stop_sessions(seat);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, NULL, r);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
+                uint32_t uid;
+                struct passwd *pw;
+                dbus_bool_t b, interactive;
+                char *path;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_UINT32, &uid,
+                                    DBUS_TYPE_BOOLEAN, &b,
+                                    DBUS_TYPE_BOOLEAN, &interactive,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                errno = 0;
+                pw = getpwuid(uid);
+                if (!pw)
+                        return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
+
+                r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, &error, r);
+
+                r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, &error, r);
+
+                path = strappend("/var/lib/systemd/linger/", pw->pw_name);
+                if (!path)
+                        goto oom;
+
+                if (b) {
+                        User *u;
+
+                        r = touch(path);
+                        free(path);
+
+                        if (r < 0)
+                                return bus_send_error_reply(connection, message, &error, r);
+
+                        if (manager_add_user_by_uid(m, uid, &u) >= 0)
+                                user_start(u);
+
+                } else {
+                        User *u;
+
+                        r = unlink(path);
+                        free(path);
+
+                        if (r < 0 && errno != ENOENT)
+                                return bus_send_error_reply(connection, message, &error, -errno);
+
+                        u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
+                        if (u)
+                                user_add_to_gc_queue(u);
+                }
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
+                const char *sysfs, *seat;
+                dbus_bool_t interactive;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_STRING, &seat,
+                                    DBUS_TYPE_STRING, &sysfs,
+                                    DBUS_TYPE_BOOLEAN, &interactive,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
+                        return bus_send_error_reply(connection, message, NULL, -EINVAL);
+
+                r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, &error, r);
+
+                r = attach_device(m, seat, sysfs);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, NULL, -EINVAL);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "FlushDevices")) {
+                dbus_bool_t interactive;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_BOOLEAN, &interactive,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                r = verify_polkit(connection, message, "org.freedesktop.login1.flush-devices", interactive, &error);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, &error, r);
+
+                r = flush_devices(m);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, NULL, -EINVAL);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "PowerOff") ||
+                   dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "Reboot")) {
+                dbus_bool_t interactive;
+                bool multiple_sessions;
+                DBusMessage *forward, *freply;
+                const char *name;
+                const char *mode = "replace";
+                const char *action;
+
+                if (!dbus_message_get_args(
+                                    message,
+                                    &error,
+                                    DBUS_TYPE_BOOLEAN, &interactive,
+                                    DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(connection, message, &error, -EINVAL);
+
+                multiple_sessions = hashmap_size(m->sessions) > 1;
+
+                if (!multiple_sessions) {
+                        Session *s;
+
+                        /* Hmm, there's only one session, but let's
+                         * make sure it actually belongs to the user
+                         * who is asking. If not, better be safe than
+                         * sorry. */
+
+                        s = hashmap_first(m->sessions);
+                        if (s) {
+                                unsigned long ul;
+
+                                ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
+                                if (ul == (unsigned long) -1)
+                                        return bus_send_error_reply(connection, message, &error, -EIO);
+
+                                multiple_sessions = s->user->uid != ul;
+                        }
+                }
+
+                if (streq(dbus_message_get_member(message), "PowerOff")) {
+                        if (multiple_sessions)
+                                action = "org.freedesktop.login1.power-off-multiple-sessions";
+                        else
+                                action = "org.freedesktop.login1.power-off";
+
+                        name = SPECIAL_POWEROFF_TARGET;
+                } else {
+                        if (multiple_sessions)
+                                action = "org.freedesktop.login1.reboot-multiple-sessions";
+                        else
+                                action = "org.freedesktop.login1.reboot";
+
+                        name = SPECIAL_REBOOT_TARGET;
+                }
+
+                r = verify_polkit(connection, message, action, interactive, &error);
+                if (r < 0)
+                        return bus_send_error_reply(connection, message, &error, r);
+
+                forward = dbus_message_new_method_call(
+                              "org.freedesktop.systemd1",
+                              "/org/freedesktop/systemd1",
+                              "org.freedesktop.systemd1.Manager",
+                              "StartUnit");
+                if (!forward)
+                        return bus_send_error_reply(connection, message, NULL, -ENOMEM);
+
+                if (!dbus_message_append_args(forward,
+                                              DBUS_TYPE_STRING, &name,
+                                              DBUS_TYPE_STRING, &mode,
+                                              DBUS_TYPE_INVALID)) {
+                        dbus_message_unref(forward);
+                        return bus_send_error_reply(connection, message, NULL, -ENOMEM);
+                }
+
+                freply = dbus_connection_send_with_reply_and_block(connection, forward, -1, &error);
+                dbus_message_unref(forward);
+
+                if (!freply)
+                        return bus_send_error_reply(connection, message, &error, -EIO);
+
+                dbus_message_unref(freply);
+
+                reply = dbus_message_new_method_return(message);
+                if (!reply)
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
+                char *introspection = NULL;
+                FILE *f;
+                Iterator i;
+                Session *session;
+                Seat *seat;
+                User *user;
+                size_t size;
+                char *p;
+
+                if (!(reply = dbus_message_new_method_return(message)))
+                        goto oom;
+
+                /* We roll our own introspection code here, instead of
+                 * relying on bus_default_message_handler() because we
+                 * need to generate our introspection string
+                 * dynamically. */
+
+                if (!(f = open_memstream(&introspection, &size)))
+                        goto oom;
+
+                fputs(INTROSPECTION_BEGIN, f);
+
+                HASHMAP_FOREACH(seat, m->seats, i) {
+                        p = bus_path_escape(seat->id);
+
+                        if (p) {
+                                fprintf(f, "<node name=\"seat/%s\"/>", p);
+                                free(p);
+                        }
+                }
+
+                HASHMAP_FOREACH(user, m->users, i)
+                        fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
+
+                HASHMAP_FOREACH(session, m->sessions, i) {
+                        p = bus_path_escape(session->id);
+
+                        if (p) {
+                                fprintf(f, "<node name=\"session/%s\"/>", p);
+                                free(p);
+                        }
+                }
+
+                fputs(INTROSPECTION_END, f);
+
+                if (ferror(f)) {
+                        fclose(f);
+                        free(introspection);
+                        goto oom;
+                }
+
+                fclose(f);
+
+                if (!introspection)
+                        goto oom;
+
+                if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
+                        free(introspection);
+                        goto oom;
+                }
+
+                free(introspection);
+        } else
+                return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
+
+        if (reply) {
+                if (!dbus_connection_send(connection, reply, NULL))
+                        goto oom;
+
+                dbus_message_unref(reply);
+        }
+
+        return DBUS_HANDLER_RESULT_HANDLED;
+
+oom:
+        if (reply)
+                dbus_message_unref(reply);
+
+        dbus_error_free(&error);
+
+        return DBUS_HANDLER_RESULT_NEED_MEMORY;
+}
+
+const DBusObjectPathVTable bus_manager_vtable = {
+        .message_function = manager_message_handler
+};
+
+DBusHandlerResult bus_message_filter(
+                DBusConnection *connection,
+                DBusMessage *message,
+                void *userdata) {
+
+        Manager *m = userdata;
+        DBusError error;
+
+        assert(m);
+        assert(connection);
+        assert(message);
+
+        dbus_error_init(&error);
+
+        if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
+                const char *cgroup;
+
+                if (!dbus_message_get_args(message, &error,
+                                           DBUS_TYPE_STRING, &cgroup,
+                                           DBUS_TYPE_INVALID))
+                        log_error("Failed to parse Released message: %s", bus_error_message(&error));
+                else
+                        manager_cgroup_notify_empty(m, cgroup);
+        }
+
+        dbus_error_free(&error);
+
+        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+}
+
+int manager_send_changed(Manager *manager, const char *properties) {
+        DBusMessage *m;
+        int r = -ENOMEM;
+
+        assert(manager);
+
+        m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
+        if (!m)
+                goto finish;
+
+        if (!dbus_connection_send(manager->bus, m, NULL))
+                goto finish;
+
+        r = 0;
+
+finish:
+        if (m)
+                dbus_message_unref(m);
+
+        return r;
+}