diff options
Diffstat (limited to 'src/core/dbus.c')
| -rw-r--r-- | src/core/dbus.c | 1483 |
1 files changed, 1483 insertions, 0 deletions
diff --git a/src/core/dbus.c b/src/core/dbus.c new file mode 100644 index 0000000000..ddf91f225a --- /dev/null +++ b/src/core/dbus.c @@ -0,0 +1,1483 @@ +/*-*- 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 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 "mkdir.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 != MANAGER_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 == MANAGER_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)) { + log_error("Not enough memory"); + return -ENOMEM; + } + + if (set_put(m->bus_connections_for_dispatch, bus) < 0) { + log_error("Not enough memory"); + return -ENOMEM; + } + + 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_error("Not enough memory."); + 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)) { + log_error("Not enough memory"); + return -ENOMEM; + } + + if (m->running_as != MANAGER_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)) { + log_error("Not enough memory"); + 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"'", + 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 == MANAGER_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 == MANAGER_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 = getenv("DBUS_SYSTEM_BUS_ADDRESS"); + if (!address || !address[0]) + address = DBUS_SYSTEM_BUS_DEFAULT_ADDRESS; + break; + case DBUS_BUS_SESSION: + address = 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 == MANAGER_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 == MANAGER_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 = getenv("XDG_RUNTIME_DIR"); + if (!e) + return 0; + + if (asprintf(&p, "unix:path=%s/systemd/private", e) < 0) { + log_error("Not enough memory"); + r = -ENOMEM; + goto fail; + } + + mkdir_parents(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)) { + log_error("Not enough memory"); + r = -ENOMEM; + 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: + log_error("Not enough memory"); + return -ENOMEM; +} + +static void shutdown_connection(Manager *m, DBusConnection *c) { + Set *s; + Job *j; + Iterator i; + + HASHMAP_FOREACH(j, m->jobs, i) + if (j->bus == c) { + free(j->bus_client); + j->bus_client = NULL; + + j->bus = NULL; + } + + 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 != MANAGER_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 == MANAGER_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 == MANAGER_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 == MANAGER_SYSTEM) + oom = !dbus_connection_send(c, message, NULL); + + SET_FOREACH(c, m->bus_connections, i) + if (c != m->system_bus || m->running_as == MANAGER_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 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_error("Out of memory."); + return; + } + + assert_cc(sizeof(usec_t) == sizeof(uint64_t)); + if (!dbus_message_append_args(message, + DBUS_TYPE_UINT64, &kernel_usec, + DBUS_TYPE_UINT64, &initrd_usec, + DBUS_TYPE_UINT64, &userspace_usec, + DBUS_TYPE_UINT64, &total_usec, + DBUS_TYPE_INVALID)) { + log_error("Out of memory."); + goto finish; + } + + + if (bus_broadcast(m, message) < 0) { + log_error("Out of memory."); + goto finish; + } + +finish: + if (message) + dbus_message_unref(message); +} |