./move.sh

1 files changed, 1258 insertions, 0 deletions

diff --git a/src/libcore/dbus.c b/src/libcore/dbus.c
new file mode 100644
index 0000000000..dc939b023a
--- /dev/null
+++ b/src/libcore/dbus.c
@@ -0,0 +1,1258 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+
+#include <systemd/sd-bus.h>
+
+#include "alloc-util.h"
+#include "bus-common-errors.h"
+#include "bus-error.h"
+#include "bus-internal.h"
+#include "bus-util.h"
+#include "dbus-cgroup.h"
+#include "dbus-execute.h"
+#include "dbus-job.h"
+#include "dbus-kill.h"
+#include "dbus-manager.h"
+#include "dbus-unit.h"
+#include "dbus.h"
+#include "fd-util.h"
+#include "log.h"
+#include "missing.h"
+#include "mkdir.h"
+#include "selinux-access.h"
+#include "special.h"
+#include "string-util.h"
+#include "strv.h"
+#include "strxcpyx.h"
+#include "user-util.h"
+
+#define CONNECTIONS_MAX 4096
+
+static void destroy_bus(Manager *m, sd_bus **bus);
+
+int bus_send_queued_message(Manager *m) {
+        int r;
+
+        assert(m);
+
+        if (!m->queued_message)
+                return 0;
+
+        /* If we cannot get rid of this message we won't dispatch any
+         * D-Bus messages, so that we won't end up wanting to queue
+         * another message. */
+
+        r = sd_bus_send(NULL, m->queued_message, NULL);
+        if (r < 0)
+                log_warning_errno(r, "Failed to send queued message: %m");
+
+        m->queued_message = sd_bus_message_unref(m->queued_message);
+
+        return 0;
+}
+
+static int signal_agent_released(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
+        const char *cgroup, *me;
+        Manager *m = userdata;
+        uid_t sender_uid;
+        sd_bus *bus;
+        int r;
+
+        assert(message);
+        assert(m);
+
+        /* ignore recursive events sent by us on the system/user bus */
+        bus = sd_bus_message_get_bus(message);
+        if (!sd_bus_is_server(bus)) {
+                r = sd_bus_get_unique_name(bus, &me);
+                if (r < 0)
+                        return r;
+
+                if (streq_ptr(sd_bus_message_get_sender(message), me))
+                        return 0;
+        }
+
+        /* only accept org.freedesktop.systemd1.Agent from UID=0 */
+        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_creds_get_euid(creds, &sender_uid);
+        if (r < 0 || sender_uid != 0)
+                return 0;
+
+        /* parse 'cgroup-empty' notification */
+        r = sd_bus_message_read(message, "s", &cgroup);
+        if (r < 0) {
+                bus_log_parse_error(r);
+                return 0;
+        }
+
+        manager_notify_cgroup_empty(m, cgroup);
+
+        /* if running as system-instance, forward under our name */
+        if (m->running_as == MANAGER_SYSTEM && m->system_bus) {
+                r = sd_bus_message_rewind(message, 1);
+                if (r >= 0)
+                        r = sd_bus_send(m->system_bus, message, NULL);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to forward Released message: %m");
+        }
+
+        return 0;
+}
+
+static int signal_disconnected(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+        sd_bus *bus;
+
+        assert(message);
+        assert(m);
+        assert_se(bus = sd_bus_message_get_bus(message));
+
+        if (bus == m->api_bus)
+                destroy_bus(m, &m->api_bus);
+        if (bus == m->system_bus)
+                destroy_bus(m, &m->system_bus);
+        if (set_remove(m->private_buses, bus)) {
+                log_debug("Got disconnect on private connection.");
+                destroy_bus(m, &bus);
+        }
+
+        return 0;
+}
+
+static int signal_activation_request(sd_bus_message *message, void *userdata, 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;
+        Manager *m = userdata;
+        const char *name;
+        Unit *u;
+        int r;
+
+        assert(message);
+        assert(m);
+
+        r = sd_bus_message_read(message, "s", &name);
+        if (r < 0) {
+                bus_log_parse_error(r);
+                return 0;
+        }
+
+        if (manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SERVICE) ||
+            manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SOCKET)) {
+                r = sd_bus_error_setf(&error, BUS_ERROR_SHUTTING_DOWN, "Refusing activation, D-Bus is shutting down.");
+                goto failed;
+        }
+
+        r = manager_load_unit(m, name, NULL, &error, &u);
+        if (r < 0)
+                goto failed;
+
+        if (u->refuse_manual_start) {
+                r = sd_bus_error_setf(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, %s may be requested by dependency only.", u->id);
+                goto failed;
+        }
+
+        r = manager_add_job(m, JOB_START, u, JOB_REPLACE, &error, NULL);
+        if (r < 0)
+                goto failed;
+
+        /* Successfully queued, that's it for us */
+        return 0;
+
+failed:
+        if (!sd_bus_error_is_set(&error))
+                sd_bus_error_set_errno(&error, r);
+
+        log_debug("D-Bus activation failed for %s: %s", name, bus_error_message(&error, r));
+
+        r = sd_bus_message_new_signal(sd_bus_message_get_bus(message), &reply, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure");
+        if (r < 0) {
+                bus_log_create_error(r);
+                return 0;
+        }
+
+        r = sd_bus_message_append(reply, "sss", name, error.name, error.message);
+        if (r < 0) {
+                bus_log_create_error(r);
+                return 0;
+        }
+
+        r = sd_bus_send_to(NULL, reply, "org.freedesktop.DBus", NULL);
+        if (r < 0)
+                return log_error_errno(r, "Failed to respond with to bus activation request: %m");
+
+        return 0;
+}
+
+#ifdef HAVE_SELINUX
+static int mac_selinux_filter(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+        const char *verb, *path;
+        Unit *u = NULL;
+        Job *j;
+        int r;
+
+        assert(message);
+
+        /* Our own method calls are all protected individually with
+         * selinux checks, but the built-in interfaces need to be
+         * protected too. */
+
+        if (sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set"))
+                verb = "reload";
+        else if (sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", NULL) ||
+                 sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Properties", NULL) ||
+                 sd_bus_message_is_method_call(message, "org.freedesktop.DBus.ObjectManager", NULL) ||
+                 sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Peer", NULL))
+                verb = "status";
+        else
+                return 0;
+
+        path = sd_bus_message_get_path(message);
+
+        if (object_path_startswith("/org/freedesktop/systemd1", path)) {
+
+                r = mac_selinux_access_check(message, verb, error);
+                if (r < 0)
+                        return r;
+
+                return 0;
+        }
+
+        if (streq_ptr(path, "/org/freedesktop/systemd1/unit/self")) {
+                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
+                pid_t pid;
+
+                r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
+                if (r < 0)
+                        return 0;
+
+                r = sd_bus_creds_get_pid(creds, &pid);
+                if (r < 0)
+                        return 0;
+
+                u = manager_get_unit_by_pid(m, pid);
+        } else {
+                r = manager_get_job_from_dbus_path(m, path, &j);
+                if (r >= 0)
+                        u = j->unit;
+                else
+                        manager_load_unit_from_dbus_path(m, path, NULL, &u);
+        }
+
+        if (!u)
+                return 0;
+
+        r = mac_selinux_unit_access_check(u, message, verb, error);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+#endif
+
+static int bus_job_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
+        Manager *m = userdata;
+        Job *j;
+        int r;
+
+        assert(bus);
+        assert(path);
+        assert(interface);
+        assert(found);
+        assert(m);
+
+        r = manager_get_job_from_dbus_path(m, path, &j);
+        if (r < 0)
+                return 0;
+
+        *found = j;
+        return 1;
+}
+
+static int find_unit(Manager *m, sd_bus *bus, const char *path, Unit **unit, sd_bus_error *error) {
+        Unit *u;
+        int r;
+
+        assert(m);
+        assert(bus);
+        assert(path);
+
+        if (streq_ptr(path, "/org/freedesktop/systemd1/unit/self")) {
+                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
+                sd_bus_message *message;
+                pid_t pid;
+
+                message = sd_bus_get_current_message(bus);
+                if (!message)
+                        return 0;
+
+                r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_creds_get_pid(creds, &pid);
+                if (r < 0)
+                        return r;
+
+                u = manager_get_unit_by_pid(m, pid);
+        } else {
+                r = manager_load_unit_from_dbus_path(m, path, error, &u);
+                if (r < 0)
+                        return 0;
+        }
+
+        if (!u)
+                return 0;
+
+        *unit = u;
+        return 1;
+}
+
+static int bus_unit_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
+        Manager *m = userdata;
+
+        assert(bus);
+        assert(path);
+        assert(interface);
+        assert(found);
+        assert(m);
+
+        return find_unit(m, bus, path, (Unit**) found, error);
+}
+
+static int bus_unit_interface_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
+        Manager *m = userdata;
+        Unit *u;
+        int r;
+
+        assert(bus);
+        assert(path);
+        assert(interface);
+        assert(found);
+        assert(m);
+
+        r = find_unit(m, bus, path, &u, error);
+        if (r <= 0)
+                return r;
+
+        if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
+                return 0;
+
+        *found = u;
+        return 1;
+}
+
+static int bus_unit_cgroup_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
+        Manager *m = userdata;
+        Unit *u;
+        int r;
+
+        assert(bus);
+        assert(path);
+        assert(interface);
+        assert(found);
+        assert(m);
+
+        r = find_unit(m, bus, path, &u, error);
+        if (r <= 0)
+                return r;
+
+        if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
+                return 0;
+
+        if (!UNIT_HAS_CGROUP_CONTEXT(u))
+                return 0;
+
+        *found = u;
+        return 1;
+}
+
+static int bus_cgroup_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
+        Manager *m = userdata;
+        CGroupContext *c;
+        Unit *u;
+        int r;
+
+        assert(bus);
+        assert(path);
+        assert(interface);
+        assert(found);
+        assert(m);
+
+        r = find_unit(m, bus, path, &u, error);
+        if (r <= 0)
+                return r;
+
+        if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
+                return 0;
+
+        c = unit_get_cgroup_context(u);
+        if (!c)
+                return 0;
+
+        *found = c;
+        return 1;
+}
+
+static int bus_exec_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
+        Manager *m = userdata;
+        ExecContext *c;
+        Unit *u;
+        int r;
+
+        assert(bus);
+        assert(path);
+        assert(interface);
+        assert(found);
+        assert(m);
+
+        r = find_unit(m, bus, path, &u, error);
+        if (r <= 0)
+                return r;
+
+        if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
+                return 0;
+
+        c = unit_get_exec_context(u);
+        if (!c)
+                return 0;
+
+        *found = c;
+        return 1;
+}
+
+static int bus_kill_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
+        Manager *m = userdata;
+        KillContext *c;
+        Unit *u;
+        int r;
+
+        assert(bus);
+        assert(path);
+        assert(interface);
+        assert(found);
+        assert(m);
+
+        r = find_unit(m, bus, path, &u, error);
+        if (r <= 0)
+                return r;
+
+        if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
+                return 0;
+
+        c = unit_get_kill_context(u);
+        if (!c)
+                return 0;
+
+        *found = c;
+        return 1;
+}
+
+static int bus_job_enumerate(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
+        _cleanup_free_ char **l = NULL;
+        Manager *m = userdata;
+        unsigned k = 0;
+        Iterator i;
+        Job *j;
+
+        l = new0(char*, hashmap_size(m->jobs)+1);
+        if (!l)
+                return -ENOMEM;
+
+        HASHMAP_FOREACH(j, m->jobs, i) {
+                l[k] = job_dbus_path(j);
+                if (!l[k])
+                        return -ENOMEM;
+
+                k++;
+        }
+
+        assert(hashmap_size(m->jobs) == k);
+
+        *nodes = l;
+        l = NULL;
+
+        return k;
+}
+
+static int bus_unit_enumerate(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
+        _cleanup_free_ char **l = NULL;
+        Manager *m = userdata;
+        unsigned k = 0;
+        Iterator i;
+        Unit *u;
+
+        l = new0(char*, hashmap_size(m->units)+1);
+        if (!l)
+                return -ENOMEM;
+
+        HASHMAP_FOREACH(u, m->units, i) {
+                l[k] = unit_dbus_path(u);
+                if (!l[k])
+                        return -ENOMEM;
+
+                k++;
+        }
+
+        *nodes = l;
+        l = NULL;
+
+        return k;
+}
+
+static int bus_setup_api_vtables(Manager *m, sd_bus *bus) {
+        UnitType t;
+        int r;
+
+        assert(m);
+        assert(bus);
+
+#ifdef HAVE_SELINUX
+        r = sd_bus_add_filter(bus, NULL, mac_selinux_filter, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add SELinux access filter: %m");
+#endif
+
+        r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", bus_manager_vtable, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to register Manager vtable: %m");
+
+        r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/job", "org.freedesktop.systemd1.Job", bus_job_vtable, bus_job_find, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to register Job vtable: %m");
+
+        r = sd_bus_add_node_enumerator(bus, NULL, "/org/freedesktop/systemd1/job", bus_job_enumerate, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add job enumerator: %m");
+
+        r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", "org.freedesktop.systemd1.Unit", bus_unit_vtable, bus_unit_find, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to register Unit vtable: %m");
+
+        r = sd_bus_add_node_enumerator(bus, NULL, "/org/freedesktop/systemd1/unit", bus_unit_enumerate, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add job enumerator: %m");
+
+        for (t = 0; t < _UNIT_TYPE_MAX; t++) {
+                const char *interface;
+
+                assert_se(interface = unit_dbus_interface_from_type(t));
+
+                r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, unit_vtable[t]->bus_vtable, bus_unit_interface_find, m);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to register type specific vtable for %s: %m", interface);
+
+                if (unit_vtable[t]->cgroup_context_offset > 0) {
+                        r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, bus_unit_cgroup_vtable, bus_unit_cgroup_find, m);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to register control group unit vtable for %s: %m", interface);
+
+                        r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, bus_cgroup_vtable, bus_cgroup_context_find, m);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to register control group vtable for %s: %m", interface);
+                }
+
+                if (unit_vtable[t]->exec_context_offset > 0) {
+                        r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, bus_exec_vtable, bus_exec_context_find, m);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to register execute vtable for %s: %m", interface);
+                }
+
+                if (unit_vtable[t]->kill_context_offset > 0) {
+                        r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, bus_kill_vtable, bus_kill_context_find, m);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to register kill vtable for %s: %m", interface);
+                }
+        }
+
+        return 0;
+}
+
+static int bus_setup_disconnected_match(Manager *m, sd_bus *bus) {
+        int r;
+
+        assert(m);
+        assert(bus);
+
+        r = sd_bus_add_match(
+                        bus,
+                        NULL,
+                        "sender='org.freedesktop.DBus.Local',"
+                        "type='signal',"
+                        "path='/org/freedesktop/DBus/Local',"
+                        "interface='org.freedesktop.DBus.Local',"
+                        "member='Disconnected'",
+                        signal_disconnected, m);
+
+        if (r < 0)
+                return log_error_errno(r, "Failed to register match for Disconnected message: %m");
+
+        return 0;
+}
+
+static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+        _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
+        _cleanup_close_ int nfd = -1;
+        Manager *m = userdata;
+        sd_id128_t id;
+        int r;
+
+        assert(s);
+        assert(m);
+
+        nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
+        if (nfd < 0) {
+                log_warning_errno(errno, "Failed to accept private connection, ignoring: %m");
+                return 0;
+        }
+
+        if (set_size(m->private_buses) >= CONNECTIONS_MAX) {
+                log_warning("Too many concurrent connections, refusing");
+                return 0;
+        }
+
+        r = set_ensure_allocated(&m->private_buses, NULL);
+        if (r < 0) {
+                log_oom();
+                return 0;
+        }
+
+        r = sd_bus_new(&bus);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to allocate new private connection bus: %m");
+                return 0;
+        }
+
+        r = sd_bus_set_fd(bus, nfd, nfd);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to set fd on new connection bus: %m");
+                return 0;
+        }
+
+        nfd = -1;
+
+        r = bus_check_peercred(bus);
+        if (r < 0) {
+                log_warning_errno(r, "Incoming private connection from unprivileged client, refusing: %m");
+                return 0;
+        }
+
+        assert_se(sd_id128_randomize(&id) >= 0);
+
+        r = sd_bus_set_server(bus, 1, id);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to enable server support for new connection bus: %m");
+                return 0;
+        }
+
+        r = sd_bus_negotiate_creds(bus, 1,
+                                   SD_BUS_CREDS_PID|SD_BUS_CREDS_UID|
+                                   SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS|
+                                   SD_BUS_CREDS_SELINUX_CONTEXT);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to enable credentials for new connection: %m");
+                return 0;
+        }
+
+        r = sd_bus_start(bus);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to start new connection bus: %m");
+                return 0;
+        }
+
+        r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to attach new connection bus to event loop: %m");
+                return 0;
+        }
+
+        if (m->running_as == MANAGER_SYSTEM) {
+                /* When we run as system instance we get the Released
+                 * signal via a direct connection */
+
+                r = sd_bus_add_match(
+                                bus,
+                                NULL,
+                                "type='signal',"
+                                "interface='org.freedesktop.systemd1.Agent',"
+                                "member='Released',"
+                                "path='/org/freedesktop/systemd1/agent'",
+                                signal_agent_released, m);
+
+                if (r < 0) {
+                        log_warning_errno(r, "Failed to register Released match on new connection bus: %m");
+                        return 0;
+                }
+        }
+
+        r = bus_setup_disconnected_match(m, bus);
+        if (r < 0)
+                return 0;
+
+        r = bus_setup_api_vtables(m, bus);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to set up API vtables on new connection bus: %m");
+                return 0;
+        }
+
+        r = set_put(m->private_buses, bus);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to add new connection bus to set: %m");
+                return 0;
+        }
+
+        bus = NULL;
+
+        log_debug("Accepted new private connection.");
+
+        return 0;
+}
+
+int manager_sync_bus_names(Manager *m, sd_bus *bus) {
+        _cleanup_strv_free_ char **names = NULL;
+        const char *name;
+        Iterator i;
+        Unit *u;
+        int r;
+
+        assert(m);
+        assert(bus);
+
+        r = sd_bus_list_names(bus, &names, NULL);
+        if (r < 0)
+                return log_error_errno(r, "Failed to get initial list of names: %m");
+
+        /* We have to synchronize the current bus names with the
+         * list of active services. To do this, walk the list of
+         * all units with bus names. */
+        HASHMAP_FOREACH_KEY(u, name, m->watch_bus, i) {
+                Service *s = SERVICE(u);
+
+                assert(s);
+
+                if (!streq_ptr(s->bus_name, name)) {
+                        log_unit_warning(u, "Bus name has changed from %s → %s, ignoring.", s->bus_name, name);
+                        continue;
+                }
+
+                /* Check if a service's bus name is in the list of currently
+                 * active names */
+                if (strv_contains(names, name)) {
+                        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
+                        const char *unique;
+
+                        /* If it is, determine its current owner */
+                        r = sd_bus_get_name_creds(bus, name, SD_BUS_CREDS_UNIQUE_NAME, &creds);
+                        if (r < 0) {
+                                log_error_errno(r, "Failed to get bus name owner %s: %m", name);
+                                continue;
+                        }
+
+                        r = sd_bus_creds_get_unique_name(creds, &unique);
+                        if (r < 0) {
+                                log_error_errno(r, "Failed to get unique name for %s: %m", name);
+                                continue;
+                        }
+
+                        /* Now, let's compare that to the previous bus owner, and
+                         * if it's still the same, all is fine, so just don't
+                         * bother the service. Otherwise, the name has apparently
+                         * changed, so synthesize a name owner changed signal. */
+
+                        if (!streq_ptr(unique, s->bus_name_owner))
+                                UNIT_VTABLE(u)->bus_name_owner_change(u, name, s->bus_name_owner, unique);
+                } else {
+                        /* So, the name we're watching is not on the bus.
+                         * This either means it simply hasn't appeared yet,
+                         * or it was lost during the daemon reload.
+                         * Check if the service has a stored name owner,
+                         * and synthesize a name loss signal in this case. */
+
+                        if (s->bus_name_owner)
+                                UNIT_VTABLE(u)->bus_name_owner_change(u, name, s->bus_name_owner, NULL);
+                }
+        }
+
+        return 0;
+}
+
+static int bus_setup_api(Manager *m, sd_bus *bus) {
+        Iterator i;
+        char *name;
+        Unit *u;
+        int r;
+
+        assert(m);
+        assert(bus);
+
+        /* Let's make sure we have enough credential bits so that we can make security and selinux decisions */
+        r = sd_bus_negotiate_creds(bus, 1,
+                                   SD_BUS_CREDS_PID|SD_BUS_CREDS_UID|
+                                   SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS|
+                                   SD_BUS_CREDS_SELINUX_CONTEXT);
+        if (r < 0)
+                log_warning_errno(r, "Failed to enable credential passing, ignoring: %m");
+
+        r = bus_setup_api_vtables(m, bus);
+        if (r < 0)
+                return r;
+
+        HASHMAP_FOREACH_KEY(u, name, m->watch_bus, i) {
+                r = unit_install_bus_match(u, bus, name);
+                if (r < 0)
+                        log_error_errno(r, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name);
+        }
+
+        r = sd_bus_add_match(
+                        bus,
+                        NULL,
+                        "type='signal',"
+                        "sender='org.freedesktop.DBus',"
+                        "path='/org/freedesktop/DBus',"
+                        "interface='org.freedesktop.systemd1.Activator',"
+                        "member='ActivationRequest'",
+                        signal_activation_request, m);
+        if (r < 0)
+                log_warning_errno(r, "Failed to subscribe to activation signal: %m");
+
+        /* Allow replacing of our name, to ease implementation of
+         * reexecution, where we keep the old connection open until
+         * after the new connection is set up and the name installed
+         * to allow clients to synchronously wait for reexecution to
+         * finish */
+        r = sd_bus_request_name(bus,"org.freedesktop.systemd1", SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_ALLOW_REPLACEMENT);
+        if (r < 0)
+                return log_error_errno(r, "Failed to register name: %m");
+
+        r = manager_sync_bus_names(m, bus);
+        if (r < 0)
+                return r;
+
+        log_debug("Successfully connected to API bus.");
+        return 0;
+}
+
+static int bus_init_api(Manager *m) {
+        _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
+        int r;
+
+        if (m->api_bus)
+                return 0;
+
+        /* The API and system bus is the same if we are running in system mode */
+        if (m->running_as == MANAGER_SYSTEM && m->system_bus)
+                bus = sd_bus_ref(m->system_bus);
+        else {
+                if (m->running_as == MANAGER_SYSTEM)
+                        r = sd_bus_open_system(&bus);
+                else
+                        r = sd_bus_open_user(&bus);
+
+                if (r < 0) {
+                        log_debug("Failed to connect to API bus, retrying later...");
+                        return 0;
+                }
+
+                r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
+                if (r < 0) {
+                        log_error_errno(r, "Failed to attach API bus to event loop: %m");
+                        return 0;
+                }
+
+                r = bus_setup_disconnected_match(m, bus);
+                if (r < 0)
+                        return 0;
+        }
+
+        r = bus_setup_api(m, bus);
+        if (r < 0) {
+                log_error_errno(r, "Failed to set up API bus: %m");
+                return 0;
+        }
+
+        m->api_bus = bus;
+        bus = NULL;
+
+        return 0;
+}
+
+static int bus_setup_system(Manager *m, sd_bus *bus) {
+        int r;
+
+        assert(m);
+        assert(bus);
+
+        /* On kdbus or if we are a user instance we get the Released message via the system bus */
+        if (m->running_as == MANAGER_USER || m->kdbus_fd >= 0) {
+                r = sd_bus_add_match(
+                                bus,
+                                NULL,
+                                "type='signal',"
+                                "interface='org.freedesktop.systemd1.Agent',"
+                                "member='Released',"
+                                "path='/org/freedesktop/systemd1/agent'",
+                                signal_agent_released, m);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to register Released match on system bus: %m");
+        }
+
+        log_debug("Successfully connected to system bus.");
+        return 0;
+}
+
+static int bus_init_system(Manager *m) {
+        _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
+        int r;
+
+        if (m->system_bus)
+                return 0;
+
+        /* The API and system bus is the same if we are running in system mode */
+        if (m->running_as == MANAGER_SYSTEM && m->api_bus) {
+                m->system_bus = sd_bus_ref(m->api_bus);
+                return 0;
+        }
+
+        r = sd_bus_open_system(&bus);
+        if (r < 0) {
+                log_debug("Failed to connect to system bus, retrying later...");
+                return 0;
+        }
+
+        r = bus_setup_disconnected_match(m, bus);
+        if (r < 0)
+                return 0;
+
+        r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
+        if (r < 0) {
+                log_error_errno(r, "Failed to attach system bus to event loop: %m");
+                return 0;
+        }
+
+        r = bus_setup_system(m, bus);
+        if (r < 0) {
+                log_error_errno(r, "Failed to set up system bus: %m");
+                return 0;
+        }
+
+        m->system_bus = bus;
+        bus = NULL;
+
+        return 0;
+}
+
+static int bus_init_private(Manager *m) {
+        _cleanup_close_ int fd = -1;
+        union sockaddr_union sa = {
+                .un.sun_family = AF_UNIX
+        };
+        sd_event_source *s;
+        socklen_t salen;
+        int r;
+
+        assert(m);
+
+        if (m->private_listen_fd >= 0)
+                return 0;
+
+        /* We don't need the private socket if we have kdbus */
+        if (m->kdbus_fd >= 0)
+                return 0;
+
+        if (m->running_as == MANAGER_SYSTEM) {
+
+                /* We want the private bus only when running as init */
+                if (getpid() != 1)
+                        return 0;
+
+                strcpy(sa.un.sun_path, "/run/systemd/private");
+                salen = offsetof(union sockaddr_union, un.sun_path) + strlen("/run/systemd/private");
+        } else {
+                size_t left = sizeof(sa.un.sun_path);
+                char *p = sa.un.sun_path;
+                const char *e;
+
+                e = secure_getenv("XDG_RUNTIME_DIR");
+                if (!e) {
+                        log_error("Failed to determine XDG_RUNTIME_DIR");
+                        return -EHOSTDOWN;
+                }
+
+                left = strpcpy(&p, left, e);
+                left = strpcpy(&p, left, "/systemd/private");
+
+                salen = sizeof(sa.un) - left;
+        }
+
+        (void) mkdir_parents_label(sa.un.sun_path, 0755);
+        (void) unlink(sa.un.sun_path);
+
+        fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+        if (fd < 0)
+                return log_error_errno(errno, "Failed to allocate private socket: %m");
+
+        r = bind(fd, &sa.sa, salen);
+        if (r < 0)
+                return log_error_errno(errno, "Failed to bind private socket: %m");
+
+        r = listen(fd, SOMAXCONN);
+        if (r < 0)
+                return log_error_errno(errno, "Failed to make private socket listening: %m");
+
+        r = sd_event_add_io(m->event, &s, fd, EPOLLIN, bus_on_connection, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to allocate event source: %m");
+
+        (void) sd_event_source_set_description(s, "bus-connection");
+
+        m->private_listen_fd = fd;
+        m->private_listen_event_source = s;
+        fd = -1;
+
+        log_debug("Successfully created private D-Bus server.");
+
+        return 0;
+}
+
+int bus_init(Manager *m, bool try_bus_connect) {
+        int r;
+
+        if (try_bus_connect) {
+                r = bus_init_system(m);
+                if (r < 0)
+                        return r;
+
+                r = bus_init_api(m);
+                if (r < 0)
+                        return r;
+        }
+
+        r = bus_init_private(m);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static void destroy_bus(Manager *m, sd_bus **bus) {
+        Iterator i;
+        Job *j;
+
+        assert(m);
+        assert(bus);
+
+        if (!*bus)
+                return;
+
+        /* Get rid of tracked clients on this bus */
+        if (m->subscribed && sd_bus_track_get_bus(m->subscribed) == *bus)
+                m->subscribed = sd_bus_track_unref(m->subscribed);
+
+        HASHMAP_FOREACH(j, m->jobs, i)
+                if (j->clients && sd_bus_track_get_bus(j->clients) == *bus)
+                        j->clients = sd_bus_track_unref(j->clients);
+
+        /* Get rid of queued message on this bus */
+        if (m->queued_message && sd_bus_message_get_bus(m->queued_message) == *bus)
+                m->queued_message = sd_bus_message_unref(m->queued_message);
+
+        /* Possibly flush unwritten data, but only if we are
+         * unprivileged, since we don't want to sync here */
+        if (m->running_as != MANAGER_SYSTEM)
+                sd_bus_flush(*bus);
+
+        /* And destroy the object */
+        sd_bus_close(*bus);
+        *bus = sd_bus_unref(*bus);
+}
+
+void bus_done(Manager *m) {
+        sd_bus *b;
+
+        assert(m);
+
+        if (m->api_bus)
+                destroy_bus(m, &m->api_bus);
+        if (m->system_bus)
+                destroy_bus(m, &m->system_bus);
+        while ((b = set_steal_first(m->private_buses)))
+                destroy_bus(m, &b);
+
+        m->private_buses = set_free(m->private_buses);
+
+        m->subscribed = sd_bus_track_unref(m->subscribed);
+        m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
+
+        if (m->private_listen_event_source)
+                m->private_listen_event_source = sd_event_source_unref(m->private_listen_event_source);
+
+        m->private_listen_fd = safe_close(m->private_listen_fd);
+
+        bus_verify_polkit_async_registry_free(m->polkit_registry);
+}
+
+int bus_fdset_add_all(Manager *m, FDSet *fds) {
+        Iterator i;
+        sd_bus *b;
+        int fd;
+
+        assert(m);
+        assert(fds);
+
+        /* When we are about to reexecute we add all D-Bus fds to the
+         * set to pass over to the newly executed systemd. They won't
+         * be used there however, except thatt they are closed at the
+         * very end of deserialization, those making it possible for
+         * clients to synchronously wait for systemd to reexec by
+         * simply waiting for disconnection */
+
+        if (m->api_bus) {
+                fd = sd_bus_get_fd(m->api_bus);
+                if (fd >= 0) {
+                        fd = fdset_put_dup(fds, fd);
+                        if (fd < 0)
+                                return fd;
+                }
+        }
+
+        SET_FOREACH(b, m->private_buses, i) {
+                fd = sd_bus_get_fd(b);
+                if (fd >= 0) {
+                        fd = fdset_put_dup(fds, fd);
+                        if (fd < 0)
+                                return fd;
+                }
+        }
+
+        /* We don't offer any APIs on the system bus (well, unless it
+         * is the same as the API bus) hence we don't bother with it
+         * here */
+
+        return 0;
+}
+
+int bus_foreach_bus(
+                Manager *m,
+                sd_bus_track *subscribed2,
+                int (*send_message)(sd_bus *bus, void *userdata),
+                void *userdata) {
+
+        Iterator i;
+        sd_bus *b;
+        int r, ret = 0;
+
+        /* Send to all direct buses, unconditionally */
+        SET_FOREACH(b, m->private_buses, i) {
+                r = send_message(b, userdata);
+                if (r < 0)
+                        ret = r;
+        }
+
+        /* Send to API bus, but only if somebody is subscribed */
+        if (sd_bus_track_count(m->subscribed) > 0 ||
+            sd_bus_track_count(subscribed2) > 0) {
+                r = send_message(m->api_bus, userdata);
+                if (r < 0)
+                        ret = r;
+        }
+
+        return ret;
+}
+
+void bus_track_serialize(sd_bus_track *t, FILE *f) {
+        const char *n;
+
+        assert(f);
+
+        for (n = sd_bus_track_first(t); n; n = sd_bus_track_next(t))
+                fprintf(f, "subscribed=%s\n", n);
+}
+
+int bus_track_deserialize_item(char ***l, const char *line) {
+        const char *e;
+        int r;
+
+        assert(l);
+        assert(line);
+
+        e = startswith(line, "subscribed=");
+        if (!e)
+                return 0;
+
+        r = strv_extend(l, e);
+        if (r < 0)
+                return r;
+
+        return 1;
+}
+
+int bus_track_coldplug(Manager *m, sd_bus_track **t, char ***l) {
+        int r = 0;
+
+        assert(m);
+        assert(t);
+        assert(l);
+
+        if (!strv_isempty(*l) && m->api_bus) {
+                char **i;
+
+                if (!*t) {
+                        r = sd_bus_track_new(m->api_bus, t, NULL, NULL);
+                        if (r < 0)
+                                return r;
+                }
+
+                r = 0;
+                STRV_FOREACH(i, *l) {
+                        int k;
+
+                        k = sd_bus_track_add_name(*t, *i);
+                        if (k < 0)
+                                r = k;
+                }
+        }
+
+        *l = strv_free(*l);
+
+        return r;
+}
+
+int bus_verify_manage_units_async(Manager *m, sd_bus_message *call, sd_bus_error *error) {
+        return bus_verify_polkit_async(call, CAP_SYS_ADMIN, "org.freedesktop.systemd1.manage-units", NULL, false, UID_INVALID, &m->polkit_registry, error);
+}
+
+int bus_verify_manage_unit_files_async(Manager *m, sd_bus_message *call, sd_bus_error *error) {
+        return bus_verify_polkit_async(call, CAP_SYS_ADMIN, "org.freedesktop.systemd1.manage-unit-files", NULL, false, UID_INVALID, &m->polkit_registry, error);
+}
+
+int bus_verify_reload_daemon_async(Manager *m, sd_bus_message *call, sd_bus_error *error) {
+        return bus_verify_polkit_async(call, CAP_SYS_ADMIN, "org.freedesktop.systemd1.reload-daemon", NULL, false, UID_INVALID, &m->polkit_registry, error);
+}
+
+int bus_verify_set_environment_async(Manager *m, sd_bus_message *call, sd_bus_error *error) {
+        return bus_verify_polkit_async(call, CAP_SYS_ADMIN, "org.freedesktop.systemd1.set-environment", NULL, false, UID_INVALID, &m->polkit_registry, error);
+}