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Systemd/src/dbus.c

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/*-*- 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 "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"
#define CONNECTIONS_MAX 52
static const char bus_properties_interface[] = BUS_PROPERTIES_INTERFACE;
static const char bus_introspectable_interface[] = BUS_INTROSPECTABLE_INTERFACE;
const char *const bus_interface_table[] = {
"org.freedesktop.DBus.Properties", bus_properties_interface,
"org.freedesktop.DBus.Introspectable", bus_introspectable_interface,
"org.freedesktop.systemd1.Manager", bus_manager_interface,
"org.freedesktop.systemd1.Job", bus_job_interface,
"org.freedesktop.systemd1.Unit", bus_unit_interface,
"org.freedesktop.systemd1.Service", bus_service_interface,
"org.freedesktop.systemd1.Socket", bus_socket_interface,
"org.freedesktop.systemd1.Target", bus_target_interface,
"org.freedesktop.systemd1.Device", bus_device_interface,
"org.freedesktop.systemd1.Mount", bus_mount_interface,
"org.freedesktop.systemd1.Automount", bus_automount_interface,
"org.freedesktop.systemd1.Snapshot", bus_snapshot_interface,
"org.freedesktop.systemd1.Swap", bus_swap_interface,
"org.freedesktop.systemd1.Timer", bus_timer_interface,
"org.freedesktop.systemd1.Path", bus_path_interface,
NULL
};
static const char *error_to_dbus(int error);
static void 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);
}
static uint32_t bus_flags_to_events(DBusWatch *bus_watch) {
unsigned flags;
uint32_t events = 0;
assert(bus_watch);
/* no watch flags for disabled watches */
if (!dbus_watch_get_enabled(bus_watch))
return 0;
flags = dbus_watch_get_flags(bus_watch);
if (flags & DBUS_WATCH_READABLE)
events |= EPOLLIN;
if (flags & DBUS_WATCH_WRITABLE)
events |= EPOLLOUT;
return events | EPOLLHUP | EPOLLERR;
}
static unsigned events_to_bus_flags(uint32_t events) {
unsigned flags = 0;
if (events & EPOLLIN)
flags |= DBUS_WATCH_READABLE;
if (events & EPOLLOUT)
flags |= DBUS_WATCH_WRITABLE;
if (events & EPOLLHUP)
flags |= DBUS_WATCH_HANGUP;
if (events & EPOLLERR)
flags |= DBUS_WATCH_ERROR;
return flags;
}
void bus_watch_event(Manager *m, Watch *w, int events) {
assert(m);
assert(w);
/* This is called by the event loop whenever there is
* something happening on D-Bus' file handles. */
if (!dbus_watch_get_enabled(w->data.bus_watch))
return;
dbus_watch_handle(w->data.bus_watch, events_to_bus_flags(events));
}
static dbus_bool_t bus_add_watch(DBusWatch *bus_watch, void *data) {
Manager *m = data;
Watch *w;
struct epoll_event ev;
assert(bus_watch);
assert(m);
if (!(w = new0(Watch, 1)))
return FALSE;
w->fd = dbus_watch_get_unix_fd(bus_watch);
w->type = WATCH_DBUS_WATCH;
w->data.bus_watch = bus_watch;
zero(ev);
ev.events = bus_flags_to_events(bus_watch);
ev.data.ptr = w;
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
if (errno != EEXIST) {
free(w);
return FALSE;
}
/* Hmm, bloody D-Bus creates multiple watches on the
* same fd. epoll() does not like that. As a dirty
* hack we simply dup() the fd and hence get a second
* one we can safely add to the epoll(). */
if ((w->fd = dup(w->fd)) < 0) {
free(w);
return FALSE;
}
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
free(w);
close_nointr_nofail(w->fd);
return FALSE;
}
w->fd_is_dupped = true;
}
dbus_watch_set_data(bus_watch, w, NULL);
return TRUE;
}
static void bus_remove_watch(DBusWatch *bus_watch, void *data) {
Manager *m = data;
Watch *w;
assert(bus_watch);
assert(m);
if (!(w = dbus_watch_get_data(bus_watch)))
return;
assert(w->type == WATCH_DBUS_WATCH);
assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
if (w->fd_is_dupped)
close_nointr_nofail(w->fd);
free(w);
}
static void bus_toggle_watch(DBusWatch *bus_watch, void *data) {
Manager *m = data;
Watch *w;
struct epoll_event ev;
assert(bus_watch);
assert(m);
assert_se(w = dbus_watch_get_data(bus_watch));
assert(w->type == WATCH_DBUS_WATCH);
zero(ev);
ev.events = bus_flags_to_events(bus_watch);
ev.data.ptr = w;
assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_MOD, w->fd, &ev) == 0);
}
static int bus_timeout_arm(Manager *m, Watch *w) {
struct itimerspec its;
assert(m);
assert(w);
zero(its);
if (dbus_timeout_get_enabled(w->data.bus_timeout)) {
timespec_store(&its.it_value, dbus_timeout_get_interval(w->data.bus_timeout) * USEC_PER_MSEC);
its.it_interval = its.it_interval;
}
if (timerfd_settime(w->fd, 0, &its, NULL) < 0)
return -errno;
return 0;
}
void bus_timeout_event(Manager *m, Watch *w, int events) {
assert(m);
assert(w);
/* This is called by the event loop whenever there is
* something happening on D-Bus' file handles. */
if (!(dbus_timeout_get_enabled(w->data.bus_timeout)))
return;
dbus_timeout_handle(w->data.bus_timeout);
}
static dbus_bool_t bus_add_timeout(DBusTimeout *timeout, void *data) {
Manager *m = data;
Watch *w;
struct epoll_event ev;
assert(timeout);
assert(m);
if (!(w = new0(Watch, 1)))
return FALSE;
if (!(w->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
goto fail;
w->type = WATCH_DBUS_TIMEOUT;
w->data.bus_timeout = timeout;
if (bus_timeout_arm(m, w) < 0)
goto fail;
zero(ev);
ev.events = EPOLLIN;
ev.data.ptr = w;
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0)
goto fail;
dbus_timeout_set_data(timeout, w, NULL);
return TRUE;
fail:
if (w->fd >= 0)
close_nointr_nofail(w->fd);
free(w);
return FALSE;
}
static void bus_remove_timeout(DBusTimeout *timeout, void *data) {
Manager *m = data;
Watch *w;
assert(timeout);
assert(m);
if (!(w = dbus_timeout_get_data(timeout)))
return;
assert(w->type == WATCH_DBUS_TIMEOUT);
assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
close_nointr_nofail(w->fd);
free(w);
}
static void bus_toggle_timeout(DBusTimeout *timeout, void *data) {
Manager *m = data;
Watch *w;
int r;
assert(timeout);
assert(m);
assert_se(w = dbus_timeout_get_data(timeout));
assert(w->type == WATCH_DBUS_TIMEOUT);
if ((r = bus_timeout_arm(m, w)) < 0)
log_error("Failed to rearm timer: %s", strerror(-r));
}
static DBusHandlerResult api_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) {
Manager *m = data;
DBusError error;
DBusMessage *reply = NULL;
assert(connection);
assert(message);
assert(m);
dbus_error_init(&error);
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", error.message);
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", error.message);
else {
int r;
Unit *u;
log_debug("Got D-Bus activation request for %s", name);
r = manager_load_unit(m, name, NULL, &error, &u);
if (r >= 0 && u->meta.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_warning("D-Bus activation failed for %s: %s", name, strerror(-r));
if (!(reply = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure")))
goto oom;
id = error.name ? error.name : error_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 spwaned now */
}
}
dbus_error_free(&error);
if (reply) {
if (!dbus_connection_send(connection, reply, NULL))
goto oom;
dbus_message_unref(reply);
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
oom:
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static DBusHandlerResult system_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) {
Manager *m = data;
DBusError error;
assert(connection);
assert(message);
assert(m);
dbus_error_init(&error);
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 (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
const char *cgroup;
if (!dbus_message_get_args(message, &error,
DBUS_TYPE_STRING, &cgroup,
DBUS_TYPE_INVALID))
log_error("Failed to parse Released message: %s", error.message);
else
cgroup_notify_empty(m, cgroup);
}
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
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 (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
const char *cgroup;
if (!dbus_message_get_args(message, &error,
DBUS_TYPE_STRING, &cgroup,
DBUS_TYPE_INVALID))
log_error("Failed to parse Released message: %s", error.message);
else
cgroup_notify_empty(m, cgroup);
}
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
unsigned bus_dispatch(Manager *m) {
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", error.message);
break;
case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
uint32_t r;
if (!dbus_message_get_args(reply,
&error,
DBUS_TYPE_UINT32, &r,
DBUS_TYPE_INVALID)) {
log_error("Failed to parse RequestName() reply: %s", error.message);
break;
}
if (r == 1)
log_debug("Successfully acquired name.");
else
log_error("Name already owned.");
break;
}
default:
assert_not_reached("Invalid reply message");
}
dbus_message_unref(reply);
dbus_error_free(&error);
}
static int request_name(Manager *m) {
const char *name = "org.freedesktop.systemd1";
uint32_t flags = 0;
DBusMessage *message = NULL;
DBusPendingCall *pending = NULL;
if (!(message = dbus_message_new_method_call(
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"RequestName")))
goto oom;
if (!dbus_message_append_args(
message,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_UINT32, &flags,
DBUS_TYPE_INVALID))
goto oom;
if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
goto oom;
if (!dbus_pending_call_set_notify(pending, request_name_pending_cb, m, NULL))
goto oom;
dbus_message_unref(message);
dbus_pending_call_unref(pending);
/* We simple ask for the name and don't wait for it. Sooner or
* later we'll have it. */
return 0;
oom:
if (pending) {
dbus_pending_call_cancel(pending);
dbus_pending_call_unref(pending);
}
if (message)
dbus_message_unref(message);
return -ENOMEM;
}
static void query_name_list_pending_cb(DBusPendingCall *pending, void *userdata) {
DBusMessage *reply;
DBusError error;
Manager *m = userdata;
assert(m);
dbus_error_init(&error);
assert_se(reply = dbus_pending_call_steal_reply(pending));
switch (dbus_message_get_type(reply)) {
case DBUS_MESSAGE_TYPE_ERROR:
assert_se(dbus_set_error_from_message(&error, reply));
log_warning("ListNames() failed: %s", error.message);
break;
case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
int r;
char **l;
if ((r = bus_parse_strv(reply, &l)) < 0)
log_warning("Failed to parse ListNames() reply: %s", strerror(-r));
else {
char **t;
STRV_FOREACH(t, l)
/* This is a bit hacky, we say the
* owner of the name is the name
* itself, because we don't want the
* extra traffic to figure out the
* real owner. */
manager_dispatch_bus_name_owner_changed(m, *t, NULL, *t);
strv_free(l);
}
break;
}
default:
assert_not_reached("Invalid reply message");
}
dbus_message_unref(reply);
dbus_error_free(&error);
}
static int query_name_list(Manager *m) {
DBusMessage *message = NULL;
DBusPendingCall *pending = NULL;
/* Asks for the currently installed bus names */
if (!(message = dbus_message_new_method_call(
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"ListNames")))
goto oom;
if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
goto oom;
if (!dbus_pending_call_set_notify(pending, query_name_list_pending_cb, m, NULL))
goto oom;
dbus_message_unref(message);
dbus_pending_call_unref(pending);
/* We simple ask for the list and don't wait for it. Sooner or
* later we'll get it. */
return 0;
oom:
if (pending) {
dbus_pending_call_cancel(pending);
dbus_pending_call_unref(pending);
}
if (message)
dbus_message_unref(message);
return -ENOMEM;
}
static int bus_setup_loop(Manager *m, DBusConnection *bus) {
assert(m);
assert(bus);
dbus_connection_set_exit_on_disconnect(bus, FALSE);
if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
!dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) {
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_root(DBusConnection *connection, unsigned long uid, void *data) {
return uid == 0;
}
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_root, 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 bus_init_system(Manager *m) {
DBusError error;
int r;
assert(m);
dbus_error_init(&error);
if (m->system_bus)
return 0;
if (m->running_as == MANAGER_SYSTEM && m->api_bus)
m->system_bus = m->api_bus;
else {
if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message);
r = 0;
goto fail;
}
if ((r = bus_setup_loop(m, m->system_bus)) < 0)
goto fail;
}
if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
log_error("Not enough memory");
r = -EIO;
goto fail;
}
dbus_bus_add_match(m->system_bus,
"type='signal',"
"interface='org.freedesktop.systemd1.Agent',"
"member='Released',"
"path='/org/freedesktop/systemd1/agent'",
&error);
if (dbus_error_is_set(&error)) {
log_error("Failed to register match: %s", error.message);
r = -EIO;
goto fail;
}
if (m->api_bus != m->system_bus) {
char *id;
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;
fail:
bus_done_system(m);
dbus_error_free(&error);
return r;
}
static int bus_init_api(Manager *m) {
DBusError error;
int r;
assert(m);
dbus_error_init(&error);
if (m->api_bus)
return 0;
if (m->running_as == MANAGER_SYSTEM && m->system_bus)
m->api_bus = m->system_bus;
else {
if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message);
r = 0;
goto fail;
}
if ((r = bus_setup_loop(m, m->api_bus)) < 0)
goto fail;
}
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");
r = -ENOMEM;
goto fail;
}
/* Get NameOwnerChange messages */
dbus_bus_add_match(m->api_bus,
"type='signal',"
"sender='"DBUS_SERVICE_DBUS"',"
"interface='"DBUS_INTERFACE_DBUS"',"
"member='NameOwnerChanged',"
"path='"DBUS_PATH_DBUS"'",
&error);
if (dbus_error_is_set(&error)) {
log_error("Failed to register match: %s", error.message);
r = -EIO;
goto fail;
}
/* Get activation requests */
dbus_bus_add_match(m->api_bus,
"type='signal',"
"sender='"DBUS_SERVICE_DBUS"',"
"interface='org.freedesktop.systemd1.Activator',"
"member='ActivationRequest',"
"path='"DBUS_PATH_DBUS"'",
&error);
if (dbus_error_is_set(&error)) {
log_error("Failed to register match: %s", error.message);
r = -EIO;
goto fail;
}
if ((r = request_name(m)) < 0)
goto fail;
if ((r = query_name_list(m)) < 0)
goto fail;
if (m->api_bus != m->system_bus) {
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);
}
return 0;
fail:
bus_done_api(m);
dbus_error_free(&error);
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;
/* We want the private bus only when running as init */
if (getpid() != 1)
return 0;
if (!(m->private_bus = dbus_server_listen("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
log_error("Failed to create private D-Bus server: %s", error.message);
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) {
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) {
log_error("Not enough memory");
return -ENOMEM;
}
if (m->name_data_slot < 0)
if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot)) {
log_error("Not enough memory");
return -ENOMEM;
}
if (m->subscribed_data_slot < 0)
if (!dbus_pending_call_allocate_data_slot(&m->subscribed_data_slot)) {
log_error("Not enough memory");
return -ENOMEM;
}
if ((r = bus_init_system(m)) < 0 ||
(r = bus_init_api(m)) < 0 ||
(r = bus_init_private(m)) < 0)
return r;
return 0;
}
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);
dbus_connection_flush(c);
dbus_connection_close(c);
dbus_connection_unref(c);
}
static void bus_done_api(Manager *m) {
assert(m);
if (m->api_bus) {
if (m->system_bus == m->api_bus)
m->system_bus = NULL;
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) {
assert(m);
if (m->system_bus == m->api_bus)
bus_done_api(m);
if (m->system_bus) {
shutdown_connection(m, m->system_bus);
m->system_bus = NULL;
}
}
static void bus_done_private(Manager *m) {
if (m->private_bus) {
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->subscribed_data_slot >= 0)
dbus_pending_call_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", error.message);
break;
case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
uint32_t r;
if (!dbus_message_get_args(reply,
&error,
DBUS_TYPE_UINT32, &r,
DBUS_TYPE_INVALID)) {
log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message);
break;
}
manager_dispatch_bus_query_pid_done(m, name, (pid_t) r);
break;
}
default:
assert_not_reached("Invalid reply message");
}
dbus_message_unref(reply);
dbus_error_free(&error);
}
int bus_query_pid(Manager *m, const char *name) {
DBusMessage *message = NULL;
DBusPendingCall *pending = NULL;
char *n = NULL;
assert(m);
assert(name);
if (!(message = dbus_message_new_method_call(
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"GetConnectionUnixProcessID")))
goto oom;
if (!(dbus_message_append_args(
message,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_INVALID)))
goto oom;
if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
goto oom;
if (!(n = strdup(name)))
goto oom;
if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free))
goto oom;
n = NULL;
if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL))
goto oom;
dbus_message_unref(message);
dbus_pending_call_unref(pending);
return 0;
oom:
free(n);
if (pending) {
dbus_pending_call_cancel(pending);
dbus_pending_call_unref(pending);
}
if (message)
dbus_message_unref(message);
return -ENOMEM;
}
DBusHandlerResult bus_default_message_handler(Manager *m, DBusConnection *c, DBusMessage *message, const char*introspection, const BusProperty *properties) {
DBusError error;
DBusMessage *reply = NULL;
int r;
assert(m);
assert(message);
dbus_error_init(&error);
if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
const char *interface, *property;
const BusProperty *p;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_STRING, &property,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, c, message, &error, -EINVAL);
for (p = properties; p->property; p++)
if (streq(p->interface, interface) && streq(p->property, property))
break;
if (p->property) {
DBusMessageIter iter, sub;
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
dbus_message_iter_init_append(reply, &iter);
if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
goto oom;
if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
if (r == -ENOMEM)
goto oom;
dbus_message_unref(reply);
return bus_send_error_reply(m, c, message, NULL, r);
}
if (!dbus_message_iter_close_container(&iter, &sub))
goto oom;
}
} else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
const char *interface;
const BusProperty *p;
DBusMessageIter iter, sub, sub2, sub3;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, c, message, &error, -EINVAL);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
dbus_message_iter_init_append(reply, &iter);
if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
goto oom;
for (p = properties; p->property; p++) {
if (interface[0] && !streq(p->interface, interface))
continue;
if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
!dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
goto oom;
if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
if (r == -ENOMEM)
goto oom;
dbus_message_unref(reply);
return bus_send_error_reply(m, c, message, NULL, r);
}
if (!dbus_message_iter_close_container(&sub2, &sub3) ||
!dbus_message_iter_close_container(&sub, &sub2))
goto oom;
}
if (!dbus_message_iter_close_container(&iter, &sub))
goto oom;
}
if (reply) {
if (!dbus_connection_send(c, reply, NULL))
goto oom;
dbus_message_unref(reply);
return DBUS_HANDLER_RESULT_HANDLED;
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
oom:
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static const char *error_to_dbus(int error) {
switch(error) {
case -EINVAL:
return DBUS_ERROR_INVALID_ARGS;
case -ENOMEM:
return DBUS_ERROR_NO_MEMORY;
case -EPERM:
case -EACCES:
return DBUS_ERROR_ACCESS_DENIED;
case -ESRCH:
return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
case -ENOENT:
return DBUS_ERROR_FILE_NOT_FOUND;
case -EEXIST:
return DBUS_ERROR_FILE_EXISTS;
case -ETIMEDOUT:
return DBUS_ERROR_TIMEOUT;
case -EIO:
return DBUS_ERROR_IO_ERROR;
case -ENETRESET:
case -ECONNABORTED:
case -ECONNRESET:
return DBUS_ERROR_DISCONNECTED;
}
return DBUS_ERROR_FAILED;
}
DBusHandlerResult bus_send_error_reply(Manager *m, DBusConnection *c, DBusMessage *message, DBusError *berror, int error) {
DBusMessage *reply = NULL;
const char *name, *text;
if (berror && dbus_error_is_set(berror)) {
name = berror->name;
text = berror->message;
} else {
name = error_to_dbus(error);
text = strerror(-error);
}
if (!(reply = dbus_message_new_error(message, name, text)))
goto oom;
if (!dbus_connection_send(c, reply, NULL))
goto oom;
dbus_message_unref(reply);
if (berror)
dbus_error_free(berror);
return DBUS_HANDLER_RESULT_HANDLED;
oom:
if (reply)
dbus_message_unref(reply);
if (berror)
dbus_error_free(berror);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
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;
}
int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
const char *t = data;
assert(m);
assert(i);
assert(property);
if (!t)
t = "";
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
return -ENOMEM;
return 0;
}
int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
DBusMessageIter sub;
char **t = data;
assert(m);
assert(i);
assert(property);
if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
return -ENOMEM;
STRV_FOREACH(t, t)
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
return -ENOMEM;
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
bool *b = data;
dbus_bool_t db;
assert(m);
assert(i);
assert(property);
assert(b);
db = *b;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
return -ENOMEM;
return 0;
}
int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
assert(m);
assert(i);
assert(property);
assert(data);
/* Let's ensure that pid_t is actually 64bit, and hence this
* function can be used for usec_t */
assert_cc(sizeof(uint64_t) == sizeof(usec_t));
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
return -ENOMEM;
return 0;
}
int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
assert(m);
assert(i);
assert(property);
assert(data);
/* Let's ensure that pid_t and mode_t is actually 32bit, and
* hence this function can be used for pid_t/mode_t */
assert_cc(sizeof(uint32_t) == sizeof(pid_t));
assert_cc(sizeof(uint32_t) == sizeof(mode_t));
assert_cc(sizeof(uint32_t) == sizeof(unsigned));
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
return -ENOMEM;
return 0;
}
int bus_property_append_int32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
assert(m);
assert(i);
assert(property);
assert(data);
assert_cc(sizeof(int32_t) == sizeof(int));
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data))
return -ENOMEM;
return 0;
}
int bus_property_append_size(Manager *m, DBusMessageIter *i, const char *property, void *data) {
uint64_t u;
assert(m);
assert(i);
assert(property);
assert(data);
u = (uint64_t) *(size_t*) data;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
return -ENOMEM;
return 0;
}
int bus_property_append_ul(Manager *m, DBusMessageIter *i, const char *property, void *data) {
uint64_t u;
assert(m);
assert(i);
assert(property);
assert(data);
u = (uint64_t) *(unsigned long*) data;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
return -ENOMEM;
return 0;
}
int bus_parse_strv(DBusMessage *m, char ***_l) {
DBusMessageIter iter, sub;
unsigned n = 0, i = 0;
char **l;
assert(m);
assert(_l);
if (!dbus_message_iter_init(m, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
return -EINVAL;
dbus_message_iter_recurse(&iter, &sub);
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
n++;
dbus_message_iter_next(&sub);
}
if (!(l = new(char*, n+1)))
return -ENOMEM;
assert_se(dbus_message_iter_init(m, &iter));
dbus_message_iter_recurse(&iter, &sub);
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
const char *s;
assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
dbus_message_iter_get_basic(&sub, &s);
if (!(l[i++] = strdup(s))) {
strv_free(l);
return -ENOMEM;
}
dbus_message_iter_next(&sub);
}
assert(i == n);
l[i] = NULL;
if (_l)
*_l = l;
return 0;
}
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));
}
DBusMessage* bus_properties_changed_new(const char *path, const char *interface, const char *properties) {
DBusMessage *m;
DBusMessageIter iter, sub;
const char *i;
assert(interface);
assert(properties);
if (!(m = dbus_message_new_signal(path, "org.freedesktop.DBus.Properties", "PropertiesChanged")))
goto oom;
dbus_message_iter_init_append(m, &iter);
/* We won't send any property values, since they might be
* large and sometimes not cheap to generated */
if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &interface) ||
!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub) ||
!dbus_message_iter_close_container(&iter, &sub) ||
!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub))
goto oom;
NULSTR_FOREACH(i, properties)
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &i))
goto oom;
if (!dbus_message_iter_close_container(&iter, &sub))
goto oom;
return m;
oom:
if (m)
dbus_message_unref(m);
return NULL;
}
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