1074 lines
32 KiB
C
1074 lines
32 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/epoll.h>
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#include <sys/timerfd.h>
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#include <errno.h>
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#include <unistd.h>
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#include "sd-bus.h"
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#include "log.h"
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#include "strv.h"
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#include "mkdir.h"
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#include "missing.h"
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#include "dbus-unit.h"
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#include "dbus-job.h"
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#include "dbus-manager.h"
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#include "dbus-execute.h"
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#include "dbus-kill.h"
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#include "dbus-cgroup.h"
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#include "special.h"
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#include "dbus.h"
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#include "bus-util.h"
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#include "bus-error.h"
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#include "bus-errors.h"
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#include "strxcpyx.h"
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#include "dbus-client-track.h"
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#define CONNECTIONS_MAX 512
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static void destroy_bus(Manager *m, sd_bus **bus);
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int bus_send_queued_message(Manager *m) {
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int r;
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assert(m);
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if (!m->queued_message)
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return 0;
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assert(m->queued_message_bus);
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/* If we cannot get rid of this message we won't dispatch any
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* D-Bus messages, so that we won't end up wanting to queue
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* another message. */
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r = sd_bus_send(m->queued_message_bus, m->queued_message, NULL);
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if (r < 0)
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log_warning("Failed to send queued message: %s", strerror(-r));
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m->queued_message = sd_bus_message_unref(m->queued_message);
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m->queued_message_bus = sd_bus_unref(m->queued_message_bus);
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return 0;
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}
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static int signal_agent_released(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Manager *m = userdata;
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const char *cgroup;
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int r;
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assert(bus);
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assert(message);
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assert(m);
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r = sd_bus_message_read(message, "s", &cgroup);
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if (r < 0) {
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bus_log_parse_error(r);
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return 0;
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}
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manager_notify_cgroup_empty(m, cgroup);
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if (m->running_as == SYSTEMD_SYSTEM && m->system_bus) {
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/* If we are running as system manager, forward the
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* message to the system bus */
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r = sd_bus_send(m->system_bus, message, NULL);
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if (r < 0)
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log_warning("Failed to forward Released message: %s", strerror(-r));
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}
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return 0;
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}
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static int signal_disconnected(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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Manager *m = userdata;
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assert(bus);
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assert(message);
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assert(m);
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if (bus == m->api_bus)
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destroy_bus(m, &m->api_bus);
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if (bus == m->system_bus)
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destroy_bus(m, &m->system_bus);
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if (set_remove(m->private_buses, bus)) {
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log_debug("Got disconnect on private connection.");
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destroy_bus(m, &bus);
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}
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return 0;
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}
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static int signal_name_owner_changed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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const char *name, *old_owner, *new_owner;
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Manager *m = userdata;
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int r;
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assert(bus);
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assert(message);
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assert(m);
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r = sd_bus_message_read(message, "sss", &name, &old_owner, &new_owner);
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if (r < 0) {
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bus_log_parse_error(r);
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return 0;
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}
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manager_dispatch_bus_name_owner_changed(
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m, name,
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isempty(old_owner) ? NULL : old_owner,
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isempty(new_owner) ? NULL : new_owner);
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return 0;
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}
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static int signal_activation_request(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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Manager *m = userdata;
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const char *name;
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Unit *u;
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int r;
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assert(bus);
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assert(message);
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assert(m);
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r = sd_bus_message_read(message, "s", &name);
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if (r < 0) {
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bus_log_parse_error(r);
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return 0;
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}
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if (manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SERVICE) ||
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manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SOCKET)) {
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r = sd_bus_error_setf(&error, BUS_ERROR_SHUTTING_DOWN, "Refusing activation, D-Bus is shutting down.");
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goto failed;
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}
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r = manager_load_unit(m, name, NULL, &error, &u);
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if (r < 0)
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goto failed;
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if (u->refuse_manual_start) {
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r = sd_bus_error_setf(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, %u may be requested by dependency only.", u->id);
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goto failed;
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}
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r = manager_add_job(m, JOB_START, u, JOB_REPLACE, true, &error, NULL);
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if (r < 0)
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goto failed;
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/* Successfully queued, that's it for us */
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return 0;
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failed:
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if (!sd_bus_error_is_set(&error))
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sd_bus_error_set_errno(&error, r);
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log_debug("D-Bus activation failed for %s: %s", name, bus_error_message(&error, r));
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r = sd_bus_message_new_signal(bus, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure", &reply);
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if (r < 0) {
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bus_log_create_error(r);
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return 0;
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}
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r = sd_bus_message_append(reply, "sss", name, error.name, error.message);
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if (r < 0) {
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bus_log_create_error(r);
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return 0;
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}
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r = sd_bus_send_to(bus, reply, "org.freedesktop.DBus", NULL);
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if (r < 0) {
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log_error("Failed to respond with to bus activation request: %s", strerror(-r));
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return r;
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}
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return 0;
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}
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static int bus_job_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
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Manager *m = userdata;
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Job *j;
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int r;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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r = manager_get_job_from_dbus_path(m, path, &j);
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if (r < 0)
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return 0;
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*found = j;
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return 1;
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}
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static Unit *find_unit(Manager *m, sd_bus *bus, const char *path) {
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Unit *u;
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int r;
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assert(m);
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assert(bus);
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assert(path);
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if (streq_ptr(path, "/org/freedesktop/systemd1/unit/self")) {
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sd_bus_message *message;
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pid_t pid;
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message = sd_bus_get_current(bus);
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if (!message)
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return NULL;
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r = sd_bus_get_owner_pid(bus, sd_bus_message_get_sender(message), &pid);
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if (r < 0)
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return NULL;
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u = manager_get_unit_by_pid(m, pid);
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} else {
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r = manager_load_unit_from_dbus_path(m, path, NULL, &u);
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if (r < 0)
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return NULL;
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}
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return u;
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}
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static int bus_unit_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
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Manager *m = userdata;
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Unit *u;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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u = find_unit(m, bus, path);
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if (!u)
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return 0;
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*found = u;
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return 1;
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}
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static int bus_unit_interface_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
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Manager *m = userdata;
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Unit *u;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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u = find_unit(m, bus, path);
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if (!u)
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return 0;
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if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
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return 0;
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*found = u;
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return 1;
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}
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static int bus_unit_cgroup_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
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Manager *m = userdata;
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Unit *u;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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u = find_unit(m, bus, path);
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if (!u)
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return 0;
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if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
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return 0;
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if (!unit_get_cgroup_context(u))
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return 0;
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*found = u;
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return 1;
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}
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static int bus_cgroup_context_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
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Manager *m = userdata;
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CGroupContext *c;
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Unit *u;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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u = find_unit(m, bus, path);
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if (!u)
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return 0;
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if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
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return 0;
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c = unit_get_cgroup_context(u);
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if (!c)
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return 0;
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*found = c;
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return 1;
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}
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static int bus_exec_context_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
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Manager *m = userdata;
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ExecContext *c;
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Unit *u;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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u = find_unit(m, bus, path);
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if (!u)
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return 0;
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if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
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return 0;
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c = unit_get_exec_context(u);
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if (!c)
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return 0;
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*found = c;
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return 1;
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}
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static int bus_kill_context_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
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Manager *m = userdata;
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KillContext *c;
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Unit *u;
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assert(bus);
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assert(path);
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assert(interface);
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assert(found);
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assert(m);
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u = find_unit(m, bus, path);
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if (!u)
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return 0;
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if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
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return 0;
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c = unit_get_kill_context(u);
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if (!c)
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return 0;
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*found = c;
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return 1;
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}
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static int bus_job_enumerate(sd_bus *bus, const char *path, char ***nodes, void *userdata) {
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_cleanup_free_ char **l = NULL;
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Manager *m = userdata;
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unsigned k = 0;
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Iterator i;
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Job *j;
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l = new0(char*, hashmap_size(m->jobs)+1);
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if (!l)
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return -ENOMEM;
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HASHMAP_FOREACH(j, m->jobs, i) {
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l[k] = job_dbus_path(j);
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if (!l[k])
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return -ENOMEM;
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k++;
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}
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assert(hashmap_size(m->jobs) == k);
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*nodes = l;
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l = NULL;
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return k;
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}
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static int bus_unit_enumerate(sd_bus *bus, const char *path, char ***nodes, void *userdata) {
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_cleanup_free_ char **l = NULL;
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Manager *m = userdata;
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unsigned k = 0;
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Iterator i;
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Unit *u;
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l = new0(char*, hashmap_size(m->units)+1);
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if (!l)
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return -ENOMEM;
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HASHMAP_FOREACH(u, m->units, i) {
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l[k] = unit_dbus_path(u);
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if (!l[k])
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return -ENOMEM;
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k++;
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}
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*nodes = l;
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l = NULL;
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return k;
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}
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static int bus_setup_api_vtables(Manager *m, sd_bus *bus) {
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UnitType t;
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int r;
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assert(m);
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assert(bus);
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r = sd_bus_add_object_vtable(bus, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", bus_manager_vtable, m);
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if (r < 0) {
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log_error("Failed to register Manager vtable: %s", strerror(-r));
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return r;
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}
|
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r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/job", "org.freedesktop.systemd1.Job", bus_job_vtable, bus_job_find, m);
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if (r < 0) {
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log_error("Failed to register Job vtable: %s", strerror(-r));
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return r;
|
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}
|
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r = sd_bus_add_node_enumerator(bus, "/org/freedesktop/systemd1/job", bus_job_enumerate, m);
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if (r < 0) {
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log_error("Failed to add job enumerator: %s", strerror(-r));
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return r;
|
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}
|
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r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", "org.freedesktop.systemd1.Unit", bus_unit_vtable, bus_unit_find, m);
|
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if (r < 0) {
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log_error("Failed to register Unit vtable: %s", strerror(-r));
|
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return r;
|
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}
|
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|
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r = sd_bus_add_node_enumerator(bus, "/org/freedesktop/systemd1/unit", bus_unit_enumerate, m);
|
|
if (r < 0) {
|
|
log_error("Failed to add job enumerator: %s", strerror(-r));
|
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return r;
|
|
}
|
|
|
|
for (t = 0; t < _UNIT_TYPE_MAX; t++) {
|
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r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, unit_vtable[t]->bus_vtable, bus_unit_interface_find, m);
|
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if (r < 0) {
|
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log_error("Failed to register type specific vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
|
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return r;
|
|
}
|
|
|
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if (unit_vtable[t]->cgroup_context_offset > 0) {
|
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r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, bus_unit_cgroup_vtable, bus_unit_cgroup_find, m);
|
|
if (r < 0) {
|
|
log_error("Failed to register control group unit vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
|
|
return r;
|
|
}
|
|
|
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r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, bus_cgroup_vtable, bus_cgroup_context_find, m);
|
|
if (r < 0) {
|
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log_error("Failed to register control group vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
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return r;
|
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}
|
|
}
|
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|
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if (unit_vtable[t]->exec_context_offset > 0) {
|
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r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, bus_exec_vtable, bus_exec_context_find, m);
|
|
if (r < 0) {
|
|
log_error("Failed to register execute vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
|
|
return r;
|
|
}
|
|
}
|
|
|
|
if (unit_vtable[t]->kill_context_offset > 0) {
|
|
r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, bus_kill_vtable, bus_kill_context_find, m);
|
|
if (r < 0) {
|
|
log_error("Failed to register kill vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
|
|
return r;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bus_setup_disconnected_match(Manager *m, sd_bus *bus) {
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(bus);
|
|
|
|
r = sd_bus_add_match(
|
|
bus,
|
|
"type='signal',"
|
|
"path='/org/freedesktop/DBus/Local',"
|
|
"interface='org.freedesktop.DBus.Local',"
|
|
"member='Disconnected'",
|
|
signal_disconnected, m);
|
|
|
|
if (r < 0) {
|
|
log_error("Failed to register match for Disconnected message: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
|
_cleanup_bus_unref_ sd_bus *bus = NULL;
|
|
_cleanup_close_ int nfd = -1;
|
|
Manager *m = userdata;
|
|
sd_id128_t id;
|
|
int r;
|
|
|
|
assert(s);
|
|
assert(m);
|
|
|
|
nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
|
|
if (nfd < 0) {
|
|
log_warning("Failed to accept private connection, ignoring: %m");
|
|
return 0;
|
|
}
|
|
|
|
if (set_size(m->private_buses) >= CONNECTIONS_MAX) {
|
|
log_warning("Too many concurrent connections, refusing");
|
|
return 0;
|
|
}
|
|
|
|
r = set_ensure_allocated(&m->private_buses, trivial_hash_func, trivial_compare_func);
|
|
if (r < 0) {
|
|
log_oom();
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_new(&bus);
|
|
if (r < 0) {
|
|
log_warning("Failed to allocate new private connection bus: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_set_fd(bus, nfd, nfd);
|
|
if (r < 0) {
|
|
log_warning("Failed to set fd on new connection bus: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
nfd = -1;
|
|
|
|
r = bus_check_peercred(bus);
|
|
if (r < 0) {
|
|
log_warning("Incoming private connection from unprivileged client, refusing: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
assert_se(sd_id128_randomize(&id) >= 0);
|
|
|
|
r = sd_bus_set_server(bus, 1, id);
|
|
if (r < 0) {
|
|
log_warning("Failed to enable server support for new connection bus: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_start(bus);
|
|
if (r < 0) {
|
|
log_warning("Failed to start new connection bus: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
|
|
if (r < 0) {
|
|
log_warning("Failed to attach new connection bus to event loop: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
if (m->running_as == SYSTEMD_SYSTEM) {
|
|
/* When we run as system instance we get the Released
|
|
* signal via a direct connection */
|
|
|
|
r = sd_bus_add_match(
|
|
bus,
|
|
"type='signal',"
|
|
"interface='org.freedesktop.systemd1.Agent',"
|
|
"member='Released',"
|
|
"path='/org/freedesktop/systemd1/agent'",
|
|
signal_agent_released, m);
|
|
|
|
if (r < 0) {
|
|
log_warning("Failed to register Released match on new connection bus: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
r = bus_setup_disconnected_match(m, bus);
|
|
if (r < 0)
|
|
return 0;
|
|
|
|
r = bus_setup_api_vtables(m, bus);
|
|
if (r < 0) {
|
|
log_warning("Failed to set up API vtables on new connection bus: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
r = set_put(m->private_buses, bus);
|
|
if (r < 0) {
|
|
log_warning("Failed to add new conenction bus to set: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
bus = NULL;
|
|
|
|
log_debug("Accepted new private connection.");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bus_list_names(Manager *m, sd_bus *bus) {
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
|
|
const char *name;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(bus);
|
|
|
|
r = sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.DBus",
|
|
"/org/freedesktop/DBus",
|
|
"org.freedesktop.DBus",
|
|
"ListNames",
|
|
&error, &reply,
|
|
NULL);
|
|
if (r < 0) {
|
|
log_error("Failed to get initial list of names: %s", bus_error_message(&error, r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_bus_message_enter_container(reply, 'a', "s");
|
|
if (r < 0)
|
|
return bus_log_parse_error(r);
|
|
|
|
/* 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. */
|
|
while ((r = sd_bus_message_read(reply, "s", &name)) > 0)
|
|
manager_dispatch_bus_name_owner_changed(m, name, NULL, name);
|
|
if (r < 0)
|
|
return bus_log_parse_error(r);
|
|
|
|
r = sd_bus_message_exit_container(reply);
|
|
if (r < 0)
|
|
return bus_log_parse_error(r);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bus_setup_api(Manager *m, sd_bus *bus) {
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(bus);
|
|
|
|
r = bus_setup_api_vtables(m, bus);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_add_match(
|
|
bus,
|
|
"type='signal',"
|
|
"sender='org.freedesktop.DBus',"
|
|
"path='/org/freedesktop/DBus',"
|
|
"interface='org.freedesktop.DBus',"
|
|
"member='NameOwnerChanged'",
|
|
signal_name_owner_changed, m);
|
|
if (r < 0)
|
|
log_warning("Failed to subscribe to NameOwnerChanged signal: %s", strerror(-r));
|
|
|
|
r = sd_bus_add_match(
|
|
bus,
|
|
"type='signal',"
|
|
"sender='org.freedesktop.DBus',"
|
|
"path='/org/freedesktop/DBus',"
|
|
"interface='org.freedesktop.systemd1.Activator',"
|
|
"member='ActivationRequest'",
|
|
signal_activation_request, m);
|
|
if (r < 0)
|
|
log_warning("Failed to subscribe to activation signal: %s", strerror(-r));
|
|
|
|
/* 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 */
|
|
r = sd_bus_request_name(bus,"org.freedesktop.systemd1", SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING);
|
|
if (r < 0) {
|
|
log_error("Failed to register name: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (r != SD_BUS_NAME_PRIMARY_OWNER) {
|
|
log_error("Failed to acquire name.");
|
|
return -EEXIST;
|
|
}
|
|
|
|
bus_list_names(m, bus);
|
|
|
|
log_debug("Successfully connected to API bus.");
|
|
return 0;
|
|
}
|
|
|
|
static int bus_init_api(Manager *m) {
|
|
_cleanup_bus_unref_ sd_bus *bus = NULL;
|
|
int r;
|
|
|
|
if (m->api_bus)
|
|
return 0;
|
|
|
|
/* The API and system bus is the same if we are running in system mode */
|
|
if (m->running_as == SYSTEMD_SYSTEM && m->system_bus)
|
|
bus = sd_bus_ref(m->system_bus);
|
|
else {
|
|
if (m->running_as == SYSTEMD_SYSTEM)
|
|
r = sd_bus_open_system(&bus);
|
|
else
|
|
r = sd_bus_open_user(&bus);
|
|
|
|
if (r < 0) {
|
|
log_debug("Failed to connect to API bus, retrying later...");
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
|
|
if (r < 0) {
|
|
log_error("Failed to attach API bus to event loop: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
r = bus_setup_disconnected_match(m, bus);
|
|
if (r < 0)
|
|
return 0;
|
|
}
|
|
|
|
r = bus_setup_api(m, bus);
|
|
if (r < 0) {
|
|
log_error("Failed to set up API bus: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
m->api_bus = bus;
|
|
bus = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bus_setup_system(Manager *m, sd_bus *bus) {
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(bus);
|
|
|
|
if (m->running_as == SYSTEMD_SYSTEM)
|
|
return 0;
|
|
|
|
/* If we are a user instance we get the Released message via
|
|
* the system bus */
|
|
r = sd_bus_add_match(
|
|
bus,
|
|
"type='signal',"
|
|
"interface='org.freedesktop.systemd1.Agent',"
|
|
"member='Released',"
|
|
"path='/org/freedesktop/systemd1/agent'",
|
|
signal_agent_released, m);
|
|
|
|
if (r < 0)
|
|
log_warning("Failed to register Released match on system bus: %s", strerror(-r));
|
|
|
|
log_debug("Successfully connected to system bus.");
|
|
return 0;
|
|
}
|
|
|
|
static int bus_init_system(Manager *m) {
|
|
_cleanup_bus_unref_ sd_bus *bus = NULL;
|
|
int r;
|
|
|
|
if (m->system_bus)
|
|
return 0;
|
|
|
|
/* The API and system bus is the same if we are running in system mode */
|
|
if (m->running_as == SYSTEMD_SYSTEM && m->api_bus) {
|
|
m->system_bus = sd_bus_ref(m->api_bus);
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_open_system(&bus);
|
|
if (r < 0) {
|
|
log_debug("Failed to connect to system bus, retrying later...");
|
|
return 0;
|
|
}
|
|
|
|
r = bus_setup_disconnected_match(m, bus);
|
|
if (r < 0)
|
|
return 0;
|
|
|
|
r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
|
|
if (r < 0) {
|
|
log_error("Failed to attach system bus to event loop: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
r = bus_setup_system(m, bus);
|
|
if (r < 0) {
|
|
log_error("Fauiled to set up system bus: %s", strerror(-r));
|
|
return 0;
|
|
}
|
|
|
|
m->system_bus = bus;
|
|
bus = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bus_init_private(Manager *m) {
|
|
_cleanup_close_ int fd = -1;
|
|
union sockaddr_union sa = {
|
|
.un.sun_family = AF_UNIX
|
|
};
|
|
sd_event_source *s;
|
|
socklen_t salen;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
if (m->private_listen_fd >= 0)
|
|
return 0;
|
|
|
|
if (m->running_as == SYSTEMD_SYSTEM) {
|
|
|
|
/* We want the private bus only when running as init */
|
|
if (getpid() != 1)
|
|
return 0;
|
|
|
|
strcpy(sa.un.sun_path, "/run/systemd/private");
|
|
salen = offsetof(union sockaddr_union, un.sun_path) + sizeof("/run/systemd/private") - 1;
|
|
} else {
|
|
size_t left = sizeof(sa.un.sun_path);
|
|
char *p = sa.un.sun_path;
|
|
const char *e;
|
|
|
|
e = secure_getenv("XDG_RUNTIME_DIR");
|
|
if (!e) {
|
|
log_error("Failed to determine XDG_RUNTIME_DIR");
|
|
return -EHOSTDOWN;
|
|
}
|
|
|
|
left = strpcpy(&p, left, e);
|
|
left = strpcpy(&p, left, "/systemd/private");
|
|
|
|
salen = sizeof(sa.un) - left;
|
|
|
|
mkdir_parents_label(sa.un.sun_path, 0755);
|
|
}
|
|
|
|
unlink(sa.un.sun_path);
|
|
|
|
fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
|
|
if (fd < 0) {
|
|
log_error("Failed to allocate private socket: %m");
|
|
return -errno;
|
|
}
|
|
|
|
r = bind(fd, &sa.sa, salen);
|
|
if (r < 0) {
|
|
log_error("Failed to bind private socket: %m");
|
|
return -errno;
|
|
}
|
|
|
|
r = listen(fd, SOMAXCONN);
|
|
if (r < 0) {
|
|
log_error("Failed to make private socket listening: %m");
|
|
return -errno;
|
|
}
|
|
|
|
r = sd_event_add_io(m->event, fd, EPOLLIN, bus_on_connection, m, &s);
|
|
if (r < 0) {
|
|
log_error("Failed to allocate event source: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
m->private_listen_fd = fd;
|
|
m->private_listen_event_source = s;
|
|
fd = -1;
|
|
|
|
log_debug("Successfully created private D-Bus server.");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bus_init(Manager *m, bool try_bus_connect) {
|
|
int r;
|
|
|
|
if (try_bus_connect) {
|
|
r = bus_init_system(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = bus_init_api(m);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
r = bus_init_private(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_bus(Manager *m, sd_bus **bus) {
|
|
Iterator i;
|
|
Job *j;
|
|
|
|
assert(m);
|
|
assert(bus);
|
|
|
|
if (!*bus)
|
|
return;
|
|
|
|
/* Get rid of tracked clients on this bus */
|
|
bus_client_untrack_bus(m->subscribed, *bus);
|
|
HASHMAP_FOREACH(j, m->jobs, i)
|
|
bus_client_untrack_bus(j->subscribed, *bus);
|
|
|
|
/* Get rid of queued message on this bus */
|
|
if (m->queued_message_bus == *bus) {
|
|
m->queued_message_bus = sd_bus_unref(m->queued_message_bus);
|
|
|
|
if (m->queued_message)
|
|
m->queued_message = sd_bus_message_unref(m->queued_message);
|
|
}
|
|
|
|
/* Possibly flush unwritten data, but only if we are
|
|
* unprivileged, since we don't want to sync here */
|
|
if (m->running_as != SYSTEMD_SYSTEM)
|
|
sd_bus_flush(*bus);
|
|
|
|
/* And destroy the object */
|
|
sd_bus_close(*bus);
|
|
*bus = sd_bus_unref(*bus);
|
|
}
|
|
|
|
void bus_done(Manager *m) {
|
|
sd_bus *b;
|
|
|
|
assert(m);
|
|
|
|
if (m->api_bus)
|
|
destroy_bus(m, &m->api_bus);
|
|
if (m->system_bus)
|
|
destroy_bus(m, &m->system_bus);
|
|
while ((b = set_steal_first(m->private_buses)))
|
|
destroy_bus(m, &b);
|
|
|
|
set_free(m->private_buses);
|
|
set_free(m->subscribed);
|
|
|
|
if (m->private_listen_event_source)
|
|
m->private_listen_event_source = sd_event_source_unref(m->private_listen_event_source);
|
|
|
|
if (m->private_listen_fd >= 0) {
|
|
close_nointr_nofail(m->private_listen_fd);
|
|
m->private_listen_fd = -1;
|
|
}
|
|
}
|
|
|
|
int bus_fdset_add_all(Manager *m, FDSet *fds) {
|
|
Iterator i;
|
|
sd_bus *b;
|
|
int fd;
|
|
|
|
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 thatt 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 */
|
|
|
|
if (m->api_bus) {
|
|
fd = sd_bus_get_fd(m->api_bus);
|
|
if (fd >= 0) {
|
|
fd = fdset_put_dup(fds, fd);
|
|
if (fd < 0)
|
|
return fd;
|
|
}
|
|
}
|
|
|
|
SET_FOREACH(b, m->private_buses, i) {
|
|
fd = sd_bus_get_fd(b);
|
|
if (fd >= 0) {
|
|
fd = fdset_put_dup(fds, fd);
|
|
if (fd < 0)
|
|
return fd;
|
|
}
|
|
}
|
|
|
|
/* We don't offer any APIs on the system bus (well, unless it
|
|
* is the same as the API bus) hence we don't bother with it
|
|
* here */
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bus_serialize(Manager *m, FILE *f) {
|
|
assert(m);
|
|
assert(f);
|
|
|
|
bus_client_track_serialize(m, f, m->subscribed);
|
|
}
|
|
|
|
int bus_deserialize_item(Manager *m, const char *line) {
|
|
assert(m);
|
|
assert(line);
|
|
|
|
return bus_client_track_deserialize_item(m, &m->subscribed, line);
|
|
}
|