/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 <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 "mkdir.h" #include "missing.h" #include "dbus-unit.h" #include "dbus-job.h" #include "dbus-manager.h" #include "dbus-service.h" #include "dbus-socket.h" #include "dbus-target.h" #include "dbus-device.h" #include "dbus-mount.h" #include "dbus-automount.h" #include "dbus-snapshot.h" #include "dbus-swap.h" #include "dbus-timer.h" #include "dbus-path.h" #include "bus-errors.h" #include "special.h" #include "dbus-common.h" #define CONNECTIONS_MAX 52 /* Well-known address (http://dbus.freedesktop.org/doc/dbus-specification.html#message-bus-types) */ #define DBUS_SYSTEM_BUS_DEFAULT_ADDRESS "unix:path=/var/run/dbus/system_bus_socket" /* Only used as a fallback */ #define DBUS_SESSION_BUS_DEFAULT_ADDRESS "autolaunch:" static const char bus_properties_interface[] = BUS_PROPERTIES_INTERFACE; static const char bus_introspectable_interface[] = BUS_INTROSPECTABLE_INTERFACE; const char *const bus_interface_table[] = { "org.freedesktop.DBus.Properties", bus_properties_interface, "org.freedesktop.DBus.Introspectable", bus_introspectable_interface, "org.freedesktop.systemd1.Manager", bus_manager_interface, "org.freedesktop.systemd1.Job", bus_job_interface, "org.freedesktop.systemd1.Unit", bus_unit_interface, "org.freedesktop.systemd1.Service", bus_service_interface, "org.freedesktop.systemd1.Socket", bus_socket_interface, "org.freedesktop.systemd1.Target", bus_target_interface, "org.freedesktop.systemd1.Device", bus_device_interface, "org.freedesktop.systemd1.Mount", bus_mount_interface, "org.freedesktop.systemd1.Automount", bus_automount_interface, "org.freedesktop.systemd1.Snapshot", bus_snapshot_interface, "org.freedesktop.systemd1.Swap", bus_swap_interface, "org.freedesktop.systemd1.Timer", bus_timer_interface, "org.freedesktop.systemd1.Path", bus_path_interface, NULL }; static void bus_done_api(Manager *m); static void bus_done_system(Manager *m); static void bus_done_private(Manager *m); static void shutdown_connection(Manager *m, DBusConnection *c); static void bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data) { Manager *m = data; assert(bus); assert(m); /* We maintain two sets, one for those connections where we * requested a dispatch, and another where we didn't. And then, * we move the connections between the two sets. */ if (status == DBUS_DISPATCH_COMPLETE) set_move_one(m->bus_connections, m->bus_connections_for_dispatch, bus); else set_move_one(m->bus_connections_for_dispatch, m->bus_connections, bus); } 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, bus_events_to_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) { close_nointr_nofail(w->fd); free(w); 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); w = dbus_watch_get_data(bus_watch); if (!w) 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); w = dbus_watch_get_data(bus_watch); if (!w) return; 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_value; } 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); w = dbus_timeout_get_data(timeout); if (!w) 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); w = dbus_timeout_get_data(timeout); if (!w) return; 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; DBusMessage *reply = NULL; assert(connection); assert(message); assert(m); dbus_error_init(&error); if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL || dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL) 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_debug("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", bus_error_message(&error)); else { if (set_remove(BUS_CONNECTION_SUBSCRIBED(m, connection), (char*) name)) log_debug("Subscription client vanished: %s (left: %u)", name, set_size(BUS_CONNECTION_SUBSCRIBED(m, connection))); 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); } } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Activator", "ActivationRequest")) { const char *name; if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) log_error("Failed to parse ActivationRequest message: %s", bus_error_message(&error)); else { int r; Unit *u; log_debug("Got D-Bus activation request for %s", name); if (manager_unit_pending_inactive(m, SPECIAL_DBUS_SERVICE) || manager_unit_pending_inactive(m, SPECIAL_DBUS_SOCKET)) { r = -EADDRNOTAVAIL; dbus_set_error(&error, BUS_ERROR_SHUTTING_DOWN, "Refusing activation, D-Bus is shutting down."); } else { r = manager_load_unit(m, name, NULL, &error, &u); if (r >= 0 && u->refuse_manual_start) r = -EPERM; if (r >= 0) r = manager_add_job(m, JOB_START, u, JOB_REPLACE, true, &error, NULL); } if (r < 0) { const char *id, *text; log_debug("D-Bus activation failed for %s: %s", name, strerror(-r)); if (!(reply = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure"))) goto oom; id = error.name ? error.name : bus_errno_to_dbus(r); text = bus_error(&error, r); if (!dbus_message_set_destination(reply, DBUS_SERVICE_DBUS) || !dbus_message_append_args(reply, DBUS_TYPE_STRING, &name, DBUS_TYPE_STRING, &id, DBUS_TYPE_STRING, &text, DBUS_TYPE_INVALID)) goto oom; } /* On success we don't do anything, the service will be spawned now */ } } dbus_error_free(&error); if (reply) { if (!dbus_connection_send(connection, reply, NULL)) goto oom; dbus_message_unref(reply); } 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 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); if (m->api_bus != m->system_bus && (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL || dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL)) log_debug("Got D-Bus request on system bus: %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_debug("System D-Bus connection terminated."); bus_done_system(m); } else if (m->running_as != SYSTEMD_SYSTEM && 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 cgroup_notify_empty(m, cgroup); } dbus_error_free(&error); return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; } static DBusHandlerResult private_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) { Manager *m = data; DBusError error; assert(connection); assert(message); assert(m); dbus_error_init(&error); if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL || dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL) 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")) shutdown_connection(m, connection); else if (m->running_as == SYSTEMD_SYSTEM && 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 cgroup_notify_empty(m, cgroup); /* Forward the message to the system bus, so that user * instances are notified as well */ if (m->system_bus) dbus_connection_send(m->system_bus, message, NULL); } dbus_error_free(&error); return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; } unsigned bus_dispatch(Manager *m) { DBusConnection *c; 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 (m->queued_message_connection) if (!dbus_connection_send(m->queued_message_connection, m->queued_message, NULL)) return 0; dbus_message_unref(m->queued_message); m->queued_message = NULL; m->queued_message_connection = NULL; } if ((c = set_first(m->bus_connections_for_dispatch))) { if (dbus_connection_dispatch(c) == DBUS_DISPATCH_COMPLETE) set_move_one(m->bus_connections, m->bus_connections_for_dispatch, c); 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", bus_error_message(&error)); 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", bus_error_message(&error)); 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"; /* 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 */ uint32_t flags = DBUS_NAME_FLAG_ALLOW_REPLACEMENT|DBUS_NAME_FLAG_REPLACE_EXISTING; 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 void query_name_list_pending_cb(DBusPendingCall *pending, void *userdata) { DBusMessage *reply; DBusError error; Manager *m = userdata; assert(m); 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("ListNames() failed: %s", bus_error_message(&error)); break; case DBUS_MESSAGE_TYPE_METHOD_RETURN: { int r; char **l; if ((r = bus_parse_strv(reply, &l)) < 0) log_warning("Failed to parse ListNames() reply: %s", strerror(-r)); else { char **t; STRV_FOREACH(t, l) /* This is a bit hacky, we say the * owner of the name is the name * itself, because we don't want the * extra traffic to figure out the * real owner. */ manager_dispatch_bus_name_owner_changed(m, *t, NULL, *t); strv_free(l); } break; } default: assert_not_reached("Invalid reply message"); } dbus_message_unref(reply); dbus_error_free(&error); } static int query_name_list(Manager *m) { DBusMessage *message = NULL; DBusPendingCall *pending = NULL; /* Asks for the currently installed bus names */ if (!(message = dbus_message_new_method_call( DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "ListNames"))) goto oom; if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1)) goto oom; if (!dbus_pending_call_set_notify(pending, query_name_list_pending_cb, m, NULL)) goto oom; dbus_message_unref(message); dbus_pending_call_unref(pending); /* We simple ask for the list and don't wait for it. Sooner or * later we'll get 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 log_oom(); if (set_put(m->bus_connections_for_dispatch, bus) < 0) return log_oom(); dbus_connection_set_dispatch_status_function(bus, bus_dispatch_status, m, NULL); return 0; } static dbus_bool_t allow_only_same_user(DBusConnection *connection, unsigned long uid, void *data) { return uid == 0 || uid == geteuid(); } static void bus_new_connection( DBusServer *server, DBusConnection *new_connection, void *data) { Manager *m = data; assert(m); if (set_size(m->bus_connections) >= CONNECTIONS_MAX) { log_error("Too many concurrent connections."); return; } dbus_connection_set_unix_user_function(new_connection, allow_only_same_user, NULL, NULL); if (bus_setup_loop(m, new_connection) < 0) return; if (!dbus_connection_register_object_path(new_connection, "/org/freedesktop/systemd1", &bus_manager_vtable, m) || !dbus_connection_register_fallback(new_connection, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) || !dbus_connection_register_fallback(new_connection, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) || !dbus_connection_add_filter(new_connection, private_bus_message_filter, m, NULL)) { log_oom(); return; } log_debug("Accepted connection on private bus."); dbus_connection_ref(new_connection); } static int init_registered_system_bus(Manager *m) { char *id; if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) return log_oom(); if (m->running_as != SYSTEMD_SYSTEM) { DBusError error; dbus_error_init(&error); dbus_bus_add_match(m->system_bus, "type='signal'," "interface='org.freedesktop.systemd1.Agent'," "member='Released'," "path='/org/freedesktop/systemd1/agent'", &error); if (dbus_error_is_set(&error)) { log_error("Failed to register match: %s", bus_error_message(&error)); dbus_error_free(&error); return -1; } } 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; } static int init_registered_api_bus(Manager *m) { int 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)) return log_oom(); /* Get NameOwnerChange messages */ dbus_bus_add_match(m->api_bus, "type='signal'," "sender='"DBUS_SERVICE_DBUS"'," "interface='"DBUS_INTERFACE_DBUS"'," "member='NameOwnerChanged'," "path='"DBUS_PATH_DBUS"'", NULL); /* Get activation requests */ dbus_bus_add_match(m->api_bus, "type='signal'," "sender='"DBUS_SERVICE_DBUS"'," "interface='org.freedesktop.systemd1.Activator'," "member='ActivationRequest'," "path='"DBUS_PATH_DBUS"'", NULL); r = request_name(m); if (r < 0) return r; r = query_name_list(m); if (r < 0) return r; if (m->running_as == SYSTEMD_USER) { char *id; 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); } else log_debug("Successfully initialized API on the system bus"); return 0; } static void bus_register_cb(DBusPendingCall *pending, void *userdata) { Manager *m = userdata; DBusConnection **conn; DBusMessage *reply; DBusError error; const char *name; int r = 0; dbus_error_init(&error); conn = dbus_pending_call_get_data(pending, m->conn_data_slot); assert(conn == &m->system_bus || conn == &m->api_bus); 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("Failed to register to bus: %s", bus_error_message(&error)); r = -1; break; case DBUS_MESSAGE_TYPE_METHOD_RETURN: if (!dbus_message_get_args(reply, &error, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) { log_error("Failed to parse Hello reply: %s", bus_error_message(&error)); r = -1; break; } log_debug("Received name %s in reply to Hello", name); if (!dbus_bus_set_unique_name(*conn, name)) { log_error("Failed to set unique name"); r = -1; break; } if (conn == &m->system_bus) { r = init_registered_system_bus(m); if (r == 0 && m->running_as == SYSTEMD_SYSTEM) r = init_registered_api_bus(m); } else r = init_registered_api_bus(m); break; default: assert_not_reached("Invalid reply message"); } dbus_message_unref(reply); dbus_error_free(&error); if (r < 0) { if (conn == &m->system_bus) { log_debug("Failed setting up the system bus"); bus_done_system(m); } else { log_debug("Failed setting up the API bus"); bus_done_api(m); } } } static int manager_bus_async_register(Manager *m, DBusConnection **conn) { DBusMessage *message = NULL; DBusPendingCall *pending = NULL; message = dbus_message_new_method_call(DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "Hello"); if (!message) goto oom; if (!dbus_connection_send_with_reply(*conn, message, &pending, -1)) goto oom; if (!dbus_pending_call_set_data(pending, m->conn_data_slot, conn, NULL)) goto oom; if (!dbus_pending_call_set_notify(pending, bus_register_cb, m, NULL)) goto oom; dbus_message_unref(message); dbus_pending_call_unref(pending); return 0; oom: if (pending) { dbus_pending_call_cancel(pending); dbus_pending_call_unref(pending); } if (message) dbus_message_unref(message); return -ENOMEM; } static DBusConnection* manager_bus_connect_private(Manager *m, DBusBusType type) { const char *address; DBusConnection *connection; DBusError error; switch (type) { case DBUS_BUS_SYSTEM: address = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS"); if (!address || !address[0]) address = DBUS_SYSTEM_BUS_DEFAULT_ADDRESS; break; case DBUS_BUS_SESSION: address = secure_getenv("DBUS_SESSION_BUS_ADDRESS"); if (!address || !address[0]) address = DBUS_SESSION_BUS_DEFAULT_ADDRESS; break; default: assert_not_reached("Invalid bus type"); } dbus_error_init(&error); connection = dbus_connection_open_private(address, &error); if (!connection) { log_warning("Failed to open private bus connection: %s", bus_error_message(&error)); goto fail; } return connection; fail: if (connection) dbus_connection_close(connection); dbus_error_free(&error); return NULL; } static int bus_init_system(Manager *m) { int r; if (m->system_bus) return 0; m->system_bus = manager_bus_connect_private(m, DBUS_BUS_SYSTEM); if (!m->system_bus) { log_debug("Failed to connect to system D-Bus, retrying later"); r = 0; goto fail; } r = bus_setup_loop(m, m->system_bus); if (r < 0) goto fail; r = manager_bus_async_register(m, &m->system_bus); if (r < 0) goto fail; return 0; fail: bus_done_system(m); return r; } static int bus_init_api(Manager *m) { int r; if (m->api_bus) return 0; if (m->running_as == SYSTEMD_SYSTEM) { m->api_bus = m->system_bus; /* In this mode there is no distinct connection to the API bus, * the API is published on the system bus. * bus_register_cb() is aware of that and will init the API * when the system bus gets registered. * No need to setup anything here. */ return 0; } m->api_bus = manager_bus_connect_private(m, DBUS_BUS_SESSION); if (!m->api_bus) { log_debug("Failed to connect to API D-Bus, retrying later"); r = 0; goto fail; } r = bus_setup_loop(m, m->api_bus); if (r < 0) goto fail; r = manager_bus_async_register(m, &m->api_bus); if (r < 0) goto fail; return 0; fail: bus_done_api(m); return r; } static int bus_init_private(Manager *m) { DBusError error; int r; const char *const external_only[] = { "EXTERNAL", NULL }; assert(m); dbus_error_init(&error); if (m->private_bus) return 0; if (m->running_as == SYSTEMD_SYSTEM) { /* We want the private bus only when running as init */ if (getpid() != 1) return 0; unlink("/run/systemd/private"); m->private_bus = dbus_server_listen("unix:path=/run/systemd/private", &error); } else { const char *e; char *p; e = secure_getenv("XDG_RUNTIME_DIR"); if (!e) return 0; if (asprintf(&p, "unix:path=%s/systemd/private", e) < 0) { r = log_oom(); goto fail; } mkdir_parents_label(p+10, 0755); unlink(p+10); m->private_bus = dbus_server_listen(p, &error); free(p); } if (!m->private_bus) { log_error("Failed to create private D-Bus server: %s", bus_error_message(&error)); r = -EIO; goto fail; } if (!dbus_server_set_auth_mechanisms(m->private_bus, (const char**) external_only) || !dbus_server_set_watch_functions(m->private_bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) || !dbus_server_set_timeout_functions(m->private_bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) { r = log_oom(); goto fail; } dbus_server_set_new_connection_function(m->private_bus, bus_new_connection, m, NULL); log_debug("Successfully created private D-Bus server."); return 0; fail: bus_done_private(m); dbus_error_free(&error); return r; } int bus_init(Manager *m, bool try_bus_connect) { int r; if (set_ensure_allocated(&m->bus_connections, trivial_hash_func, trivial_compare_func) < 0 || set_ensure_allocated(&m->bus_connections_for_dispatch, trivial_hash_func, trivial_compare_func) < 0) goto oom; if (m->name_data_slot < 0) if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot)) goto oom; if (m->conn_data_slot < 0) if (!dbus_pending_call_allocate_data_slot(&m->conn_data_slot)) goto oom; if (m->subscribed_data_slot < 0) if (!dbus_connection_allocate_data_slot(&m->subscribed_data_slot)) goto oom; if (try_bus_connect) { if ((r = bus_init_system(m)) < 0 || (r = bus_init_api(m)) < 0) return r; } if ((r = bus_init_private(m)) < 0) return r; return 0; oom: return log_oom(); } static void shutdown_connection(Manager *m, DBusConnection *c) { Set *s; Job *j; Iterator i; HASHMAP_FOREACH(j, m->jobs, i) { JobBusClient *cl, *nextcl; LIST_FOREACH_SAFE(client, cl, nextcl, j->bus_client_list) { if (cl->bus == c) { LIST_REMOVE(JobBusClient, client, j->bus_client_list, cl); free(cl); } } } set_remove(m->bus_connections, c); set_remove(m->bus_connections_for_dispatch, c); if ((s = BUS_CONNECTION_SUBSCRIBED(m, c))) { char *t; while ((t = set_steal_first(s))) free(t); set_free(s); } if (m->queued_message_connection == c) { m->queued_message_connection = NULL; if (m->queued_message) { dbus_message_unref(m->queued_message); m->queued_message = NULL; } } dbus_connection_set_dispatch_status_function(c, NULL, NULL, NULL); /* system manager cannot afford to block on DBus */ if (m->running_as != SYSTEMD_SYSTEM) dbus_connection_flush(c); dbus_connection_close(c); dbus_connection_unref(c); } static void bus_done_api(Manager *m) { if (!m->api_bus) return; if (m->running_as == SYSTEMD_USER) shutdown_connection(m, m->api_bus); m->api_bus = NULL; if (m->queued_message) { dbus_message_unref(m->queued_message); m->queued_message = NULL; } } static void bus_done_system(Manager *m) { if (!m->system_bus) return; if (m->running_as == SYSTEMD_SYSTEM) bus_done_api(m); shutdown_connection(m, m->system_bus); m->system_bus = NULL; } static void bus_done_private(Manager *m) { if (!m->private_bus) return; dbus_server_disconnect(m->private_bus); dbus_server_unref(m->private_bus); m->private_bus = NULL; } void bus_done(Manager *m) { DBusConnection *c; bus_done_api(m); bus_done_system(m); bus_done_private(m); while ((c = set_steal_first(m->bus_connections))) shutdown_connection(m, c); while ((c = set_steal_first(m->bus_connections_for_dispatch))) shutdown_connection(m, c); set_free(m->bus_connections); set_free(m->bus_connections_for_dispatch); if (m->name_data_slot >= 0) dbus_pending_call_free_data_slot(&m->name_data_slot); if (m->conn_data_slot >= 0) dbus_pending_call_free_data_slot(&m->conn_data_slot); if (m->subscribed_data_slot >= 0) dbus_connection_free_data_slot(&m->subscribed_data_slot); } 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 = BUS_PENDING_CALL_NAME(m, pending)); 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", bus_error_message(&error)); 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", bus_error_message(&error)); 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; } int bus_broadcast(Manager *m, DBusMessage *message) { bool oom = false; Iterator i; DBusConnection *c; assert(m); assert(message); SET_FOREACH(c, m->bus_connections_for_dispatch, i) if (c != m->system_bus || m->running_as == SYSTEMD_SYSTEM) oom = !dbus_connection_send(c, message, NULL); SET_FOREACH(c, m->bus_connections, i) if (c != m->system_bus || m->running_as == SYSTEMD_SYSTEM) oom = !dbus_connection_send(c, message, NULL); return oom ? -ENOMEM : 0; } bool bus_has_subscriber(Manager *m) { Iterator i; DBusConnection *c; assert(m); SET_FOREACH(c, m->bus_connections_for_dispatch, i) if (bus_connection_has_subscriber(m, c)) return true; SET_FOREACH(c, m->bus_connections, i) if (bus_connection_has_subscriber(m, c)) return true; return false; } bool bus_connection_has_subscriber(Manager *m, DBusConnection *c) { assert(m); assert(c); return !set_isempty(BUS_CONNECTION_SUBSCRIBED(m, c)); } int bus_fdset_add_all(Manager *m, FDSet *fds) { Iterator i; DBusConnection *c; 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 that 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 */ SET_FOREACH(c, m->bus_connections_for_dispatch, i) { int fd; if (dbus_connection_get_unix_fd(c, &fd)) { fd = fdset_put_dup(fds, fd); if (fd < 0) return fd; } } SET_FOREACH(c, m->bus_connections, i) { int fd; if (dbus_connection_get_unix_fd(c, &fd)) { fd = fdset_put_dup(fds, fd); if (fd < 0) return fd; } } return 0; } void bus_broadcast_finished( Manager *m, usec_t firmware_usec, usec_t loader_usec, usec_t kernel_usec, usec_t initrd_usec, usec_t userspace_usec, usec_t total_usec) { DBusMessage *message; assert(m); message = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartupFinished"); if (!message) { log_oom(); return; } assert_cc(sizeof(usec_t) == sizeof(uint64_t)); if (!dbus_message_append_args(message, DBUS_TYPE_UINT64, &firmware_usec, DBUS_TYPE_UINT64, &loader_usec, DBUS_TYPE_UINT64, &kernel_usec, DBUS_TYPE_UINT64, &initrd_usec, DBUS_TYPE_UINT64, &userspace_usec, DBUS_TYPE_UINT64, &total_usec, DBUS_TYPE_INVALID)) { log_oom(); goto finish; } if (bus_broadcast(m, message) < 0) { log_oom(); goto finish; } finish: if (message) dbus_message_unref(message); }