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-rw-r--r--src/core/dbus.c1483
1 files changed, 1483 insertions, 0 deletions
diff --git a/src/core/dbus.c b/src/core/dbus.c
new file mode 100644
index 000000000..ddf91f225
--- /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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-05 16:56:03 +0000