blob: a04ebb19b37d047cecf56cab4dbd06e7a66154ba [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* D-Bus helper library
*
* Copyright (C) 2004-2011 Marcel Holtmann <marcel@holtmann.org>
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glib.h>
#include <dbus/dbus.h>
#include "gdbus.h"
#define info(fmt...)
#define error(fmt...)
#define debug(fmt...)
struct timeout_handler {
guint id;
DBusTimeout *timeout;
};
struct watch_info {
guint id;
DBusWatch *watch;
DBusConnection *conn;
};
struct disconnect_data {
GDBusWatchFunction function;
void *user_data;
};
static gboolean disconnected_signal(DBusConnection *conn,
DBusMessage *msg, void *data)
{
struct disconnect_data *dc_data = data;
error("Got disconnected from the system message bus");
dc_data->function(conn, dc_data->user_data);
dbus_connection_unref(conn);
return TRUE;
}
static gboolean message_dispatch(void *data)
{
DBusConnection *conn = data;
/* Dispatch messages */
while (dbus_connection_dispatch(conn) == DBUS_DISPATCH_DATA_REMAINS);
dbus_connection_unref(conn);
return FALSE;
}
static inline void queue_dispatch(DBusConnection *conn,
DBusDispatchStatus status)
{
if (status == DBUS_DISPATCH_DATA_REMAINS)
g_idle_add(message_dispatch, dbus_connection_ref(conn));
}
static gboolean watch_func(GIOChannel *chan, GIOCondition cond, gpointer data)
{
struct watch_info *info = data;
unsigned int flags = 0;
DBusDispatchStatus status;
DBusConnection *conn;
if (cond & G_IO_IN) flags |= DBUS_WATCH_READABLE;
if (cond & G_IO_OUT) flags |= DBUS_WATCH_WRITABLE;
if (cond & G_IO_HUP) flags |= DBUS_WATCH_HANGUP;
if (cond & G_IO_ERR) flags |= DBUS_WATCH_ERROR;
/* Protect connection from being destroyed by dbus_watch_handle */
conn = dbus_connection_ref(info->conn);
dbus_watch_handle(info->watch, flags);
status = dbus_connection_get_dispatch_status(conn);
queue_dispatch(conn, status);
dbus_connection_unref(conn);
return TRUE;
}
static void watch_info_free(void *data)
{
struct watch_info *info = data;
if (info->id > 0) {
g_source_remove(info->id);
info->id = 0;
}
dbus_connection_unref(info->conn);
g_free(info);
}
static dbus_bool_t add_watch(DBusWatch *watch, void *data)
{
DBusConnection *conn = data;
GIOCondition cond = G_IO_HUP | G_IO_ERR;
GIOChannel *chan;
struct watch_info *info;
unsigned int flags;
int fd;
if (!dbus_watch_get_enabled(watch))
return TRUE;
info = g_new0(struct watch_info, 1);
fd = dbus_watch_get_unix_fd(watch);
chan = g_io_channel_unix_new(fd);
info->watch = watch;
info->conn = dbus_connection_ref(conn);
dbus_watch_set_data(watch, info, watch_info_free);
flags = dbus_watch_get_flags(watch);
if (flags & DBUS_WATCH_READABLE) cond |= G_IO_IN;
if (flags & DBUS_WATCH_WRITABLE) cond |= G_IO_OUT;
info->id = g_io_add_watch(chan, cond, watch_func, info);
g_io_channel_unref(chan);
return TRUE;
}
static void remove_watch(DBusWatch *watch, void *data)
{
if (dbus_watch_get_enabled(watch))
return;
/* will trigger watch_info_free() */
dbus_watch_set_data(watch, NULL, NULL);
}
static void watch_toggled(DBusWatch *watch, void *data)
{
/* Because we just exit on OOM, enable/disable is
* no different from add/remove */
if (dbus_watch_get_enabled(watch))
add_watch(watch, data);
else
remove_watch(watch, data);
}
static gboolean timeout_handler_dispatch(gpointer data)
{
struct timeout_handler *handler = data;
handler->id = 0;
/* if not enabled should not be polled by the main loop */
if (!dbus_timeout_get_enabled(handler->timeout))
return FALSE;
dbus_timeout_handle(handler->timeout);
return FALSE;
}
static void timeout_handler_free(void *data)
{
struct timeout_handler *handler = data;
if (handler->id > 0) {
g_source_remove(handler->id);
handler->id = 0;
}
g_free(handler);
}
static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data)
{
int interval = dbus_timeout_get_interval(timeout);
struct timeout_handler *handler;
if (!dbus_timeout_get_enabled(timeout))
return TRUE;
handler = g_new0(struct timeout_handler, 1);
handler->timeout = timeout;
dbus_timeout_set_data(timeout, handler, timeout_handler_free);
handler->id = g_timeout_add(interval, timeout_handler_dispatch,
handler);
return TRUE;
}
static void remove_timeout(DBusTimeout *timeout, void *data)
{
/* will trigger timeout_handler_free() */
dbus_timeout_set_data(timeout, NULL, NULL);
}
static void timeout_toggled(DBusTimeout *timeout, void *data)
{
if (dbus_timeout_get_enabled(timeout))
add_timeout(timeout, data);
else
remove_timeout(timeout, data);
}
static void dispatch_status(DBusConnection *conn,
DBusDispatchStatus status, void *data)
{
if (!dbus_connection_get_is_connected(conn))
return;
queue_dispatch(conn, status);
}
static inline void setup_dbus_with_main_loop(DBusConnection *conn)
{
dbus_connection_set_watch_functions(conn, add_watch, remove_watch,
watch_toggled, conn, NULL);
dbus_connection_set_timeout_functions(conn, add_timeout, remove_timeout,
timeout_toggled, NULL, NULL);
dbus_connection_set_dispatch_status_function(conn, dispatch_status,
NULL, NULL);
}
static gboolean setup_bus(DBusConnection *conn, const char *name,
DBusError *error)
{
gboolean result;
DBusDispatchStatus status;
if (name != NULL) {
result = g_dbus_request_name(conn, name, error);
if (error != NULL) {
if (dbus_error_is_set(error) == TRUE)
return FALSE;
}
if (result == FALSE)
return FALSE;
}
setup_dbus_with_main_loop(conn);
status = dbus_connection_get_dispatch_status(conn);
queue_dispatch(conn, status);
return TRUE;
}
DBusConnection *g_dbus_setup_bus(DBusBusType type, const char *name,
DBusError *error)
{
DBusConnection *conn;
conn = dbus_bus_get(type, error);
if (error != NULL) {
if (dbus_error_is_set(error) == TRUE)
return NULL;
}
if (conn == NULL)
return NULL;
if (setup_bus(conn, name, error) == FALSE) {
dbus_connection_unref(conn);
return NULL;
}
return conn;
}
DBusConnection *g_dbus_setup_private(DBusBusType type, const char *name,
DBusError *error)
{
DBusConnection *conn;
conn = dbus_bus_get_private(type, error);
if (error != NULL) {
if (dbus_error_is_set(error) == TRUE)
return NULL;
}
if (conn == NULL)
return NULL;
if (setup_bus(conn, name, error) == FALSE) {
dbus_connection_close(conn);
dbus_connection_unref(conn);
return NULL;
}
return conn;
}
gboolean g_dbus_request_name(DBusConnection *connection, const char *name,
DBusError *error)
{
int result;
result = dbus_bus_request_name(connection, name,
DBUS_NAME_FLAG_DO_NOT_QUEUE, error);
if (error != NULL) {
if (dbus_error_is_set(error) == TRUE)
return FALSE;
}
if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
if (error != NULL)
dbus_set_error(error, name, "Name already in use");
return FALSE;
}
return TRUE;
}
gboolean g_dbus_set_disconnect_function(DBusConnection *connection,
GDBusWatchFunction function,
void *user_data, DBusFreeFunction destroy)
{
struct disconnect_data *dc_data;
dc_data = g_new0(struct disconnect_data, 1);
dc_data->function = function;
dc_data->user_data = user_data;
dbus_connection_set_exit_on_disconnect(connection, FALSE);
if (g_dbus_add_signal_watch(connection, NULL, NULL,
DBUS_INTERFACE_LOCAL, "Disconnected",
disconnected_signal, dc_data, g_free) == 0) {
error("Failed to add watch for D-Bus Disconnected signal");
g_free(dc_data);
return FALSE;
}
return TRUE;
}