build-sys: move source files to subdirectory

1 files changed, 1136 insertions, 0 deletions

diff --git a/src/dbus.c b/src/dbus.c
new file mode 100644
index 0000000000..6ed659a239
--- /dev/null
+++ b/src/dbus.c
@@ -0,0 +1,1136 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+  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 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 <sys/epoll.h>
+#include <sys/timerfd.h>
+#include <errno.h>
+#include <unistd.h>
+#include <dbus/dbus.h>
+
+#include "dbus.h"
+#include "log.h"
+#include "strv.h"
+#include "cgroup.h"
+#include "dbus-unit.h"
+#include "dbus-job.h"
+#include "dbus-manager.h"
+
+static void api_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
+        Manager *m = data;
+
+        assert(bus);
+        assert(m);
+
+        if (!m->api_bus)
+                return;
+
+        assert(m->api_bus == bus);
+
+        m->request_api_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
+}
+
+static void system_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
+        Manager *m = data;
+
+        assert(bus);
+        assert(m);
+
+        if (!m->system_bus)
+                return;
+
+        assert(m->system_bus == bus);
+
+        m->request_system_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
+}
+
+static uint32_t bus_flags_to_events(DBusWatch *bus_watch) {
+        unsigned flags;
+        uint32_t events = 0;
+
+        assert(bus_watch);
+
+        /* no watch flags for disabled watches */
+        if (!dbus_watch_get_enabled(bus_watch))
+                return 0;
+
+        flags = dbus_watch_get_flags(bus_watch);
+
+        if (flags & DBUS_WATCH_READABLE)
+                events |= EPOLLIN;
+        if (flags & DBUS_WATCH_WRITABLE)
+                events |= EPOLLOUT;
+
+        return events | EPOLLHUP | EPOLLERR;
+}
+
+static unsigned events_to_bus_flags(uint32_t events) {
+        unsigned flags = 0;
+
+        if (events & EPOLLIN)
+                flags |= DBUS_WATCH_READABLE;
+        if (events & EPOLLOUT)
+                flags |= DBUS_WATCH_WRITABLE;
+        if (events & EPOLLHUP)
+                flags |= DBUS_WATCH_HANGUP;
+        if (events & EPOLLERR)
+                flags |= DBUS_WATCH_ERROR;
+
+        return flags;
+}
+
+void bus_watch_event(Manager *m, Watch *w, int events) {
+        assert(m);
+        assert(w);
+
+        /* This is called by the event loop whenever there is
+         * something happening on D-Bus' file handles. */
+
+        if (!dbus_watch_get_enabled(w->data.bus_watch))
+                return;
+
+        dbus_watch_handle(w->data.bus_watch, events_to_bus_flags(events));
+}
+
+static dbus_bool_t bus_add_watch(DBusWatch *bus_watch, void *data) {
+        Manager *m = data;
+        Watch *w;
+        struct epoll_event ev;
+
+        assert(bus_watch);
+        assert(m);
+
+        if (!(w = new0(Watch, 1)))
+                return FALSE;
+
+        w->fd = dbus_watch_get_unix_fd(bus_watch);
+        w->type = WATCH_DBUS_WATCH;
+        w->data.bus_watch = bus_watch;
+
+        zero(ev);
+        ev.events = bus_flags_to_events(bus_watch);
+        ev.data.ptr = w;
+
+        if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
+
+                if (errno != EEXIST) {
+                        free(w);
+                        return FALSE;
+                }
+
+                /* Hmm, bloody D-Bus creates multiple watches on the
+                 * same fd. epoll() does not like that. As a dirty
+                 * hack we simply dup() the fd and hence get a second
+                 * one we can safely add to the epoll(). */
+
+                if ((w->fd = dup(w->fd)) < 0) {
+                        free(w);
+                        return FALSE;
+                }
+
+                if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
+                        free(w);
+                        close_nointr_nofail(w->fd);
+                        return FALSE;
+                }
+
+                w->fd_is_dupped = true;
+        }
+
+        dbus_watch_set_data(bus_watch, w, NULL);
+
+        return TRUE;
+}
+
+static void bus_remove_watch(DBusWatch *bus_watch, void *data) {
+        Manager *m = data;
+        Watch *w;
+
+        assert(bus_watch);
+        assert(m);
+
+        if (!(w = dbus_watch_get_data(bus_watch)))
+                return;
+
+        assert(w->type == WATCH_DBUS_WATCH);
+        assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
+
+        if (w->fd_is_dupped)
+                close_nointr_nofail(w->fd);
+
+        free(w);
+}
+
+static void bus_toggle_watch(DBusWatch *bus_watch, void *data) {
+        Manager *m = data;
+        Watch *w;
+        struct epoll_event ev;
+
+        assert(bus_watch);
+        assert(m);
+
+        assert_se(w = dbus_watch_get_data(bus_watch));
+        assert(w->type == WATCH_DBUS_WATCH);
+
+        zero(ev);
+        ev.events = bus_flags_to_events(bus_watch);
+        ev.data.ptr = w;
+
+        assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_MOD, w->fd, &ev) == 0);
+}
+
+static int bus_timeout_arm(Manager *m, Watch *w) {
+        struct itimerspec its;
+
+        assert(m);
+        assert(w);
+
+        zero(its);
+
+        if (dbus_timeout_get_enabled(w->data.bus_timeout)) {
+                timespec_store(&its.it_value, dbus_timeout_get_interval(w->data.bus_timeout) * USEC_PER_MSEC);
+                its.it_interval = its.it_interval;
+        }
+
+        if (timerfd_settime(w->fd, 0, &its, NULL) < 0)
+                return -errno;
+
+        return 0;
+}
+
+void bus_timeout_event(Manager *m, Watch *w, int events) {
+        assert(m);
+        assert(w);
+
+        /* This is called by the event loop whenever there is
+         * something happening on D-Bus' file handles. */
+
+        if (!(dbus_timeout_get_enabled(w->data.bus_timeout)))
+                return;
+
+        dbus_timeout_handle(w->data.bus_timeout);
+}
+
+static dbus_bool_t bus_add_timeout(DBusTimeout *timeout, void *data) {
+        Manager *m = data;
+        Watch *w;
+        struct epoll_event ev;
+
+        assert(timeout);
+        assert(m);
+
+        if (!(w = new0(Watch, 1)))
+                return FALSE;
+
+        if (!(w->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
+                goto fail;
+
+        w->type = WATCH_DBUS_TIMEOUT;
+        w->data.bus_timeout = timeout;
+
+        if (bus_timeout_arm(m, w) < 0)
+                goto fail;
+
+        zero(ev);
+        ev.events = EPOLLIN;
+        ev.data.ptr = w;
+
+        if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0)
+                goto fail;
+
+        dbus_timeout_set_data(timeout, w, NULL);
+
+        return TRUE;
+
+fail:
+        if (w->fd >= 0)
+                close_nointr_nofail(w->fd);
+
+        free(w);
+        return FALSE;
+}
+
+static void bus_remove_timeout(DBusTimeout *timeout, void *data) {
+        Manager *m = data;
+        Watch *w;
+
+        assert(timeout);
+        assert(m);
+
+        if (!(w = dbus_timeout_get_data(timeout)))
+                return;
+
+        assert(w->type == WATCH_DBUS_TIMEOUT);
+        assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
+        close_nointr_nofail(w->fd);
+        free(w);
+}
+
+static void bus_toggle_timeout(DBusTimeout *timeout, void *data) {
+        Manager *m = data;
+        Watch *w;
+        int r;
+
+        assert(timeout);
+        assert(m);
+
+        assert_se(w = dbus_timeout_get_data(timeout));
+        assert(w->type == WATCH_DBUS_TIMEOUT);
+
+        if ((r = bus_timeout_arm(m, w)) < 0)
+                log_error("Failed to rearm timer: %s", strerror(-r));
+}
+
+static DBusHandlerResult api_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
+        Manager *m = data;
+        DBusError error;
+
+        assert(connection);
+        assert(message);
+        assert(m);
+
+        dbus_error_init(&error);
+
+        /* log_debug("Got D-Bus request: %s.%s() on %s", */
+        /*           dbus_message_get_interface(message), */
+        /*           dbus_message_get_member(message), */
+        /*           dbus_message_get_path(message)); */
+
+        if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
+                log_error("Warning! API D-Bus connection terminated.");
+                bus_done_api(m);
+
+        } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
+                const char *name, *old_owner, *new_owner;
+
+                if (!dbus_message_get_args(message, &error,
+                                           DBUS_TYPE_STRING, &name,
+                                           DBUS_TYPE_STRING, &old_owner,
+                                           DBUS_TYPE_STRING, &new_owner,
+                                           DBUS_TYPE_INVALID))
+                        log_error("Failed to parse NameOwnerChanged message: %s", error.message);
+                else  {
+                        if (set_remove(m->subscribed, (char*) name))
+                                log_debug("Subscription client vanished: %s (left: %u)", name, set_size(m->subscribed));
+
+                        if (old_owner[0] == 0)
+                                old_owner = NULL;
+
+                        if (new_owner[0] == 0)
+                                new_owner = NULL;
+
+                        manager_dispatch_bus_name_owner_changed(m, name, old_owner, new_owner);
+                }
+        }
+
+        dbus_error_free(&error);
+        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+}
+
+static DBusHandlerResult system_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
+        Manager *m = data;
+        DBusError error;
+
+        assert(connection);
+        assert(message);
+        assert(m);
+
+        dbus_error_init(&error);
+
+        /* log_debug("Got D-Bus request: %s.%s() on %s", */
+        /*           dbus_message_get_interface(message), */
+        /*           dbus_message_get_member(message), */
+        /*           dbus_message_get_path(message)); */
+
+        if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
+                log_error("Warning! System D-Bus connection terminated.");
+                bus_done_system(m);
+
+        } 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", error.message);
+                else
+                        cgroup_notify_empty(m, cgroup);
+        }
+
+        dbus_error_free(&error);
+        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+}
+
+unsigned bus_dispatch(Manager *m) {
+        assert(m);
+
+        if (m->queued_message) {
+                /* 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. */
+
+                if (!dbus_connection_send(m->api_bus, m->queued_message, NULL))
+                        return 0;
+
+                dbus_message_unref(m->queued_message);
+                m->queued_message = NULL;
+        }
+
+        if (m->request_api_bus_dispatch) {
+                if (dbus_connection_dispatch(m->api_bus) == DBUS_DISPATCH_COMPLETE)
+                        m->request_api_bus_dispatch = false;
+
+                return 1;
+        }
+
+        if (m->request_system_bus_dispatch) {
+                if (dbus_connection_dispatch(m->system_bus) == DBUS_DISPATCH_COMPLETE)
+                        m->request_system_bus_dispatch = false;
+
+                return 1;
+        }
+
+        return 0;
+}
+
+static void request_name_pending_cb(DBusPendingCall *pending, void *userdata) {
+        DBusMessage *reply;
+        DBusError error;
+
+        dbus_error_init(&error);
+
+        assert_se(reply = dbus_pending_call_steal_reply(pending));
+
+        switch (dbus_message_get_type(reply)) {
+
+        case DBUS_MESSAGE_TYPE_ERROR:
+
+                assert_se(dbus_set_error_from_message(&error, reply));
+                log_warning("RequestName() failed: %s", error.message);
+                break;
+
+        case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
+                uint32_t r;
+
+                if (!dbus_message_get_args(reply,
+                                           &error,
+                                           DBUS_TYPE_UINT32, &r,
+                                           DBUS_TYPE_INVALID)) {
+                        log_error("Failed to parse RequestName() reply: %s", error.message);
+                        break;
+                }
+
+                if (r == 1)
+                        log_debug("Successfully acquired name.");
+                else
+                        log_error("Name already owned.");
+
+                break;
+        }
+
+        default:
+                assert_not_reached("Invalid reply message");
+        }
+
+        dbus_message_unref(reply);
+        dbus_error_free(&error);
+}
+
+static int request_name(Manager *m) {
+        const char *name = "org.freedesktop.systemd1";
+        uint32_t flags = 0;
+        DBusMessage *message = NULL;
+        DBusPendingCall *pending = NULL;
+
+        if (!(message = dbus_message_new_method_call(
+                              DBUS_SERVICE_DBUS,
+                              DBUS_PATH_DBUS,
+                              DBUS_INTERFACE_DBUS,
+                              "RequestName")))
+                goto oom;
+
+        if (!dbus_message_append_args(
+                            message,
+                            DBUS_TYPE_STRING, &name,
+                            DBUS_TYPE_UINT32, &flags,
+                            DBUS_TYPE_INVALID))
+                goto oom;
+
+        if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
+                goto oom;
+
+        if (!dbus_pending_call_set_notify(pending, request_name_pending_cb, m, NULL))
+                goto oom;
+
+        dbus_message_unref(message);
+        dbus_pending_call_unref(pending);
+
+        /* We simple ask for the name and don't wait for it. Sooner or
+         * later we'll have it. */
+
+        return 0;
+
+oom:
+        if (pending) {
+                dbus_pending_call_cancel(pending);
+                dbus_pending_call_unref(pending);
+        }
+
+        if (message)
+                dbus_message_unref(message);
+
+        return -ENOMEM;
+}
+
+static int bus_setup_loop(Manager *m, DBusConnection *bus) {
+        assert(m);
+        assert(bus);
+
+        dbus_connection_set_exit_on_disconnect(bus, FALSE);
+
+        if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
+            !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL))
+                return -ENOMEM;
+
+        return 0;
+}
+
+int bus_init_system(Manager *m) {
+        DBusError error;
+        char *id;
+        int r;
+
+        assert(m);
+
+        dbus_error_init(&error);
+
+        if (m->system_bus)
+                return 0;
+
+        if (m->running_as != MANAGER_SESSION && m->api_bus)
+                m->system_bus = m->api_bus;
+        else {
+                if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
+                        log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message);
+                        dbus_error_free(&error);
+                        return 0;
+                }
+
+                dbus_connection_set_dispatch_status_function(m->system_bus, system_bus_dispatch_status, m, NULL);
+                m->request_system_bus_dispatch = true;
+
+                if ((r = bus_setup_loop(m, m->system_bus)) < 0) {
+                        bus_done_system(m);
+                        return r;
+                }
+        }
+
+        if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
+                bus_done_system(m);
+                return -ENOMEM;
+        }
+
+        dbus_bus_add_match(m->system_bus,
+                           "type='signal',"
+                           "interface='org.freedesktop.systemd1.Agent',"
+                           "path='/org/freedesktop/systemd1/agent'",
+                           &error);
+
+        if (dbus_error_is_set(&error)) {
+                log_error("Failed to register match: %s", error.message);
+                dbus_error_free(&error);
+                bus_done_system(m);
+                return -ENOMEM;
+        }
+
+        log_debug("Successfully connected to system D-Bus bus %s as %s",
+                  strnull((id = dbus_connection_get_server_id(m->system_bus))),
+                  strnull(dbus_bus_get_unique_name(m->system_bus)));
+        dbus_free(id);
+
+        return 0;
+}
+
+int bus_init_api(Manager *m) {
+        DBusError error;
+        char *id;
+        int r;
+
+        assert(m);
+
+        dbus_error_init(&error);
+
+        if (m->api_bus)
+                return 0;
+
+        if (m->name_data_slot < 0)
+                if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot))
+                        return -ENOMEM;
+
+        if (m->running_as != MANAGER_SESSION && m->system_bus)
+                m->api_bus = m->system_bus;
+        else {
+                if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
+                        log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message);
+                        dbus_error_free(&error);
+                        return 0;
+                }
+
+                dbus_connection_set_dispatch_status_function(m->api_bus, api_bus_dispatch_status, m, NULL);
+                m->request_api_bus_dispatch = true;
+
+                if ((r = bus_setup_loop(m, m->api_bus)) < 0) {
+                        bus_done_api(m);
+                        return r;
+                }
+        }
+
+        if (!dbus_connection_register_object_path(m->api_bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
+            !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
+            !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
+            !dbus_connection_add_filter(m->api_bus, api_bus_message_filter, m, NULL)) {
+                bus_done_api(m);
+                return -ENOMEM;
+        }
+
+        dbus_bus_add_match(m->api_bus,
+                           "type='signal',"
+                           "sender='"DBUS_SERVICE_DBUS"',"
+                           "interface='"DBUS_INTERFACE_DBUS"',"
+                           "path='"DBUS_PATH_DBUS"'",
+                           &error);
+
+        if (dbus_error_is_set(&error)) {
+                log_error("Failed to register match: %s", error.message);
+                dbus_error_free(&error);
+                bus_done_api(m);
+                return -ENOMEM;
+        }
+
+        if ((r = request_name(m)) < 0) {
+                bus_done_api(m);
+                return r;
+        }
+
+        log_debug("Successfully connected to API D-Bus bus %s as %s",
+                  strnull((id = dbus_connection_get_server_id(m->api_bus))),
+                  strnull(dbus_bus_get_unique_name(m->api_bus)));
+        dbus_free(id);
+
+        if (!m->subscribed)
+                if (!(m->subscribed = set_new(string_hash_func, string_compare_func)))
+                        return -ENOMEM;
+
+        return 0;
+}
+
+void bus_done_api(Manager *m) {
+        assert(m);
+
+        if (m->api_bus) {
+                if (m->system_bus == m->api_bus)
+                        m->system_bus = NULL;
+
+                dbus_connection_set_dispatch_status_function(m->api_bus, NULL, NULL, NULL);
+                dbus_connection_flush(m->api_bus);
+                dbus_connection_close(m->api_bus);
+                dbus_connection_unref(m->api_bus);
+                m->api_bus = NULL;
+        }
+
+        if (m->subscribed) {
+                char *c;
+
+                while ((c = set_steal_first(m->subscribed)))
+                        free(c);
+
+                set_free(m->subscribed);
+                m->subscribed = NULL;
+        }
+
+       if (m->name_data_slot >= 0)
+               dbus_pending_call_free_data_slot(&m->name_data_slot);
+
+       if (m->queued_message) {
+               dbus_message_unref(m->queued_message);
+               m->queued_message = NULL;
+       }
+}
+
+void bus_done_system(Manager *m) {
+        assert(m);
+
+        if (m->system_bus == m->api_bus)
+                bus_done_api(m);
+
+        if (m->system_bus) {
+                dbus_connection_set_dispatch_status_function(m->system_bus, NULL, NULL, NULL);
+                dbus_connection_flush(m->system_bus);
+                dbus_connection_close(m->system_bus);
+                dbus_connection_unref(m->system_bus);
+                m->system_bus = NULL;
+        }
+}
+
+static void query_pid_pending_cb(DBusPendingCall *pending, void *userdata) {
+        Manager *m = userdata;
+        DBusMessage *reply;
+        DBusError error;
+        const char *name;
+
+        dbus_error_init(&error);
+
+        assert_se(name = dbus_pending_call_get_data(pending, m->name_data_slot));
+        assert_se(reply = dbus_pending_call_steal_reply(pending));
+
+        switch (dbus_message_get_type(reply)) {
+
+        case DBUS_MESSAGE_TYPE_ERROR:
+
+                assert_se(dbus_set_error_from_message(&error, reply));
+                log_warning("GetConnectionUnixProcessID() failed: %s", error.message);
+                break;
+
+        case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
+                uint32_t r;
+
+                if (!dbus_message_get_args(reply,
+                                           &error,
+                                           DBUS_TYPE_UINT32, &r,
+                                           DBUS_TYPE_INVALID)) {
+                        log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message);
+                        break;
+                }
+
+                manager_dispatch_bus_query_pid_done(m, name, (pid_t) r);
+                break;
+        }
+
+        default:
+                assert_not_reached("Invalid reply message");
+        }
+
+        dbus_message_unref(reply);
+        dbus_error_free(&error);
+}
+
+int bus_query_pid(Manager *m, const char *name) {
+        DBusMessage *message = NULL;
+        DBusPendingCall *pending = NULL;
+        char *n = NULL;
+
+        assert(m);
+        assert(name);
+
+        if (!(message = dbus_message_new_method_call(
+                              DBUS_SERVICE_DBUS,
+                              DBUS_PATH_DBUS,
+                              DBUS_INTERFACE_DBUS,
+                              "GetConnectionUnixProcessID")))
+                goto oom;
+
+        if (!(dbus_message_append_args(
+                              message,
+                              DBUS_TYPE_STRING, &name,
+                              DBUS_TYPE_INVALID)))
+                goto oom;
+
+        if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
+                goto oom;
+
+        if (!(n = strdup(name)))
+                goto oom;
+
+        if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free))
+                goto oom;
+
+        n = NULL;
+
+        if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL))
+                goto oom;
+
+        dbus_message_unref(message);
+        dbus_pending_call_unref(pending);
+
+        return 0;
+
+oom:
+        free(n);
+
+        if (pending) {
+                dbus_pending_call_cancel(pending);
+                dbus_pending_call_unref(pending);
+        }
+
+        if (message)
+                dbus_message_unref(message);
+
+        return -ENOMEM;
+}
+
+DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char*introspection, const BusProperty *properties) {
+        DBusError error;
+        DBusMessage *reply = NULL;
+        int r;
+
+        assert(m);
+        assert(message);
+
+        dbus_error_init(&error);
+
+        if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
+
+                if (!(reply = dbus_message_new_method_return(message)))
+                        goto oom;
+
+                if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
+                        goto oom;
+
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
+                const char *interface, *property;
+                const BusProperty *p;
+
+                if (!dbus_message_get_args(
+                            message,
+                            &error,
+                            DBUS_TYPE_STRING, &interface,
+                            DBUS_TYPE_STRING, &property,
+                            DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(m, message, &error, -EINVAL);
+
+                for (p = properties; p->property; p++)
+                        if (streq(p->interface, interface) && streq(p->property, property))
+                                break;
+
+                if (p->property) {
+                        DBusMessageIter iter, sub;
+
+                        if (!(reply = dbus_message_new_method_return(message)))
+                                goto oom;
+
+                        dbus_message_iter_init_append(reply, &iter);
+
+                        if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
+                                goto oom;
+
+                        if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
+
+                                if (r == -ENOMEM)
+                                        goto oom;
+
+                                dbus_message_unref(reply);
+                                return bus_send_error_reply(m, message, NULL, r);
+                        }
+
+                        if (!dbus_message_iter_close_container(&iter, &sub))
+                                goto oom;
+                }
+        } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
+                const char *interface;
+                const BusProperty *p;
+                DBusMessageIter iter, sub, sub2, sub3;
+                bool any = false;
+
+                if (!dbus_message_get_args(
+                            message,
+                            &error,
+                            DBUS_TYPE_STRING, &interface,
+                            DBUS_TYPE_INVALID))
+                        return bus_send_error_reply(m, message, &error, -EINVAL);
+
+                if (!(reply = dbus_message_new_method_return(message)))
+                        goto oom;
+
+                dbus_message_iter_init_append(reply, &iter);
+
+                if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
+                        goto oom;
+
+                for (p = properties; p->property; p++) {
+                        if (!streq(p->interface, interface))
+                                continue;
+
+                        if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
+                            !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
+                            !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
+                                goto oom;
+
+                        if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
+
+                                if (r == -ENOMEM)
+                                        goto oom;
+
+                                dbus_message_unref(reply);
+                                return bus_send_error_reply(m, message, NULL, r);
+                        }
+
+                        if (!dbus_message_iter_close_container(&sub2, &sub3) ||
+                            !dbus_message_iter_close_container(&sub, &sub2))
+                                goto oom;
+
+                        any = true;
+                }
+
+                if (!dbus_message_iter_close_container(&iter, &sub))
+                        goto oom;
+        }
+
+        if (reply) {
+                if (!dbus_connection_send(m->api_bus, reply, NULL))
+                        goto oom;
+
+                dbus_message_unref(reply);
+                return DBUS_HANDLER_RESULT_HANDLED;
+        }
+
+        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+
+oom:
+        if (reply)
+                dbus_message_unref(reply);
+
+        dbus_error_free(&error);
+
+        return DBUS_HANDLER_RESULT_NEED_MEMORY;
+}
+
+static const char *error_to_dbus(int error) {
+
+        switch(error) {
+
+        case -EINVAL:
+                return DBUS_ERROR_INVALID_ARGS;
+
+        case -ENOMEM:
+                return DBUS_ERROR_NO_MEMORY;
+
+        case -EPERM:
+        case -EACCES:
+                return DBUS_ERROR_ACCESS_DENIED;
+
+        case -ESRCH:
+                return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
+
+        case -ENOENT:
+                return DBUS_ERROR_FILE_NOT_FOUND;
+
+        case -EEXIST:
+                return DBUS_ERROR_FILE_EXISTS;
+
+        case -ETIMEDOUT:
+                return DBUS_ERROR_TIMEOUT;
+
+        case -EIO:
+                return DBUS_ERROR_IO_ERROR;
+
+        case -ENETRESET:
+        case -ECONNABORTED:
+        case -ECONNRESET:
+                return DBUS_ERROR_DISCONNECTED;
+        }
+
+        return DBUS_ERROR_FAILED;
+}
+
+DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error) {
+        DBusMessage *reply = NULL;
+        const char *name, *text;
+
+        if (bus_error && dbus_error_is_set(bus_error)) {
+                name = bus_error->name;
+                text = bus_error->message;
+        } else {
+                name = error_to_dbus(error);
+                text = strerror(-error);
+        }
+
+        if (!(reply = dbus_message_new_error(message, name, text)))
+                goto oom;
+
+        if (!dbus_connection_send(m->api_bus, reply, NULL))
+                goto oom;
+
+        dbus_message_unref(reply);
+
+        if (bus_error)
+                dbus_error_free(bus_error);
+
+        return DBUS_HANDLER_RESULT_HANDLED;
+
+oom:
+        if (reply)
+                dbus_message_unref(reply);
+
+        if (bus_error)
+                dbus_error_free(bus_error);
+
+        return DBUS_HANDLER_RESULT_NEED_MEMORY;
+}
+
+int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        const char *t = data;
+
+        assert(m);
+        assert(i);
+        assert(property);
+
+        if (!t)
+                t = "";
+
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
+                return -ENOMEM;
+
+        return 0;
+}
+
+int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        DBusMessageIter sub;
+        char **t = data;
+
+        assert(m);
+        assert(i);
+        assert(property);
+
+        if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
+                return -ENOMEM;
+
+        STRV_FOREACH(t, t)
+                if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
+                        return -ENOMEM;
+
+        if (!dbus_message_iter_close_container(i, &sub))
+                return -ENOMEM;
+
+        return 0;
+}
+
+int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        bool *b = data;
+        dbus_bool_t db;
+
+        assert(m);
+        assert(i);
+        assert(property);
+        assert(b);
+
+        db = *b;
+
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
+                return -ENOMEM;
+
+        return 0;
+}
+
+int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        assert(m);
+        assert(i);
+        assert(property);
+        assert(data);
+
+        /* Let's ensure that pid_t is actually 64bit, and hence this
+         * function can be used for usec_t */
+        assert_cc(sizeof(uint64_t) == sizeof(usec_t));
+
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
+                return -ENOMEM;
+
+        return 0;
+}
+
+int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        assert(m);
+        assert(i);
+        assert(property);
+        assert(data);
+
+        /* Let's ensure that pid_t and mode_t is actually 32bit, and
+         * hence this function can be used for pid_t/mode_t */
+        assert_cc(sizeof(uint32_t) == sizeof(pid_t));
+        assert_cc(sizeof(uint32_t) == sizeof(mode_t));
+        assert_cc(sizeof(uint32_t) == sizeof(unsigned));
+
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
+                return -ENOMEM;
+
+        return 0;
+}
+
+int bus_property_append_int32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        assert(m);
+        assert(i);
+        assert(property);
+        assert(data);
+
+        assert_cc(sizeof(int32_t) == sizeof(int));
+
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data))
+                return -ENOMEM;
+
+        return 0;
+}
+
+int bus_parse_strv(DBusMessage *m, char ***_l) {
+        DBusMessageIter iter, sub;
+        unsigned n = 0, i = 0;
+        char **l;
+
+        assert(m);
+        assert(_l);
+
+        if (!dbus_message_iter_init(m, &iter) ||
+            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
+            dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
+            return -EINVAL;
+
+        dbus_message_iter_recurse(&iter, &sub);
+
+        while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
+                n++;
+                dbus_message_iter_next(&sub);
+        }
+
+        if (!(l = new(char*, n+1)))
+                return -ENOMEM;
+
+        assert_se(dbus_message_iter_init(m, &iter));
+        dbus_message_iter_recurse(&iter, &sub);
+
+        while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
+                const char *s;
+
+                assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
+                dbus_message_iter_get_basic(&sub, &s);
+
+                if (!(l[i++] = strdup(s))) {
+                        strv_free(l);
+                        return -ENOMEM;
+                }
+
+                dbus_message_iter_next(&sub);
+        }
+
+        assert(i == n);
+        l[i] = NULL;
+
+        if (_l)
+                *_l = l;
+
+        return 0;
+}