/*-*- 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" #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" 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 const char *error_to_dbus(int error); 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; DBusMessage *reply = NULL; 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); } } 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", error.message); else { int r; Unit *u; log_debug("Got D-Bus activation request for %s", name); r = manager_load_unit(m, name, NULL, &u); if (r >= 0 && u->meta.only_by_dependency) r = -EPERM; if (r >= 0) r = manager_add_job(m, JOB_START, u, JOB_REPLACE, true, NULL); if (r < 0) { const char *id, *text; log_warning("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_to_dbus(r); text = strerror(-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 spwaned 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); /* 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); } else 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 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", error.message); 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 -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'," "member='Released'," "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; } /* 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"'", &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; } /* 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"'", &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; } if ((r = query_name_list(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; }