hostap/wpa_supplicant/dbus/dbus_common.c

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/*
* wpa_supplicant D-Bus control interface - common functionality
* Copyright (c) 2006, Dan Williams <dcbw@redhat.com> and Red Hat, Inc.
* Copyright (c) 2009, Witold Sowa <witold.sowa@gmail.com>
* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "utils/includes.h"
#include <dbus/dbus.h>
#include "utils/common.h"
#include "utils/eloop.h"
#include "dbus_common.h"
#include "dbus_common_i.h"
#include "dbus_new.h"
#include "dbus.h"
/**
* dispatch_initial_dbus_messages - Dispatch initial dbus messages after
* claiming bus name
* @eloop_ctx: the DBusConnection to dispatch on
* @timeout_ctx: unused
*
* If clients are quick to notice that service claimed its bus name,
* there may have been messages that came in before initialization was
* all finished. Dispatch those here.
*/
static void dispatch_initial_dbus_messages(void *eloop_ctx, void *timeout_ctx)
{
DBusConnection *con = eloop_ctx;
while (dbus_connection_get_dispatch_status(con) ==
DBUS_DISPATCH_DATA_REMAINS)
dbus_connection_dispatch(con);
}
static void process_watch(struct wpas_dbus_priv *priv,
DBusWatch *watch, eloop_event_type type)
{
dbus_connection_ref(priv->con);
priv->should_dispatch = 0;
if (type == EVENT_TYPE_READ)
dbus_watch_handle(watch, DBUS_WATCH_READABLE);
else if (type == EVENT_TYPE_WRITE)
dbus_watch_handle(watch, DBUS_WATCH_WRITABLE);
else if (type == EVENT_TYPE_EXCEPTION)
dbus_watch_handle(watch, DBUS_WATCH_ERROR);
if (priv->should_dispatch) {
while (dbus_connection_get_dispatch_status(priv->con) ==
DBUS_DISPATCH_DATA_REMAINS)
dbus_connection_dispatch(priv->con);
priv->should_dispatch = 0;
}
dbus_connection_unref(priv->con);
}
static void process_watch_exception(int sock, void *eloop_ctx, void *sock_ctx)
{
process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_EXCEPTION);
}
static void process_watch_read(int sock, void *eloop_ctx, void *sock_ctx)
{
process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_READ);
}
static void process_watch_write(int sock, void *eloop_ctx, void *sock_ctx)
{
process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_WRITE);
}
static void connection_setup_add_watch(struct wpas_dbus_priv *priv,
DBusWatch *watch)
{
unsigned int flags;
int fd;
if (!dbus_watch_get_enabled(watch))
return;
flags = dbus_watch_get_flags(watch);
fd = dbus_watch_get_unix_fd(watch);
eloop_register_sock(fd, EVENT_TYPE_EXCEPTION, process_watch_exception,
priv, watch);
if (flags & DBUS_WATCH_READABLE) {
eloop_register_sock(fd, EVENT_TYPE_READ, process_watch_read,
priv, watch);
}
if (flags & DBUS_WATCH_WRITABLE) {
eloop_register_sock(fd, EVENT_TYPE_WRITE, process_watch_write,
priv, watch);
}
dbus_watch_set_data(watch, priv, NULL);
}
static void connection_setup_remove_watch(struct wpas_dbus_priv *priv,
DBusWatch *watch)
{
unsigned int flags;
int fd;
flags = dbus_watch_get_flags(watch);
fd = dbus_watch_get_unix_fd(watch);
eloop_unregister_sock(fd, EVENT_TYPE_EXCEPTION);
if (flags & DBUS_WATCH_READABLE)
eloop_unregister_sock(fd, EVENT_TYPE_READ);
if (flags & DBUS_WATCH_WRITABLE)
eloop_unregister_sock(fd, EVENT_TYPE_WRITE);
dbus_watch_set_data(watch, NULL, NULL);
}
static dbus_bool_t add_watch(DBusWatch *watch, void *data)
{
connection_setup_add_watch(data, watch);
return TRUE;
}
static void remove_watch(DBusWatch *watch, void *data)
{
connection_setup_remove_watch(data, watch);
}
static void watch_toggled(DBusWatch *watch, void *data)
{
if (dbus_watch_get_enabled(watch))
add_watch(watch, data);
else
remove_watch(watch, data);
}
static void process_timeout(void *eloop_ctx, void *sock_ctx)
{
DBusTimeout *timeout = sock_ctx;
dbus_timeout_handle(timeout);
}
static void connection_setup_add_timeout(struct wpas_dbus_priv *priv,
DBusTimeout *timeout)
{
if (!dbus_timeout_get_enabled(timeout))
return;
eloop_register_timeout(0, dbus_timeout_get_interval(timeout) * 1000,
process_timeout, priv, timeout);
dbus_timeout_set_data(timeout, priv, NULL);
}
static void connection_setup_remove_timeout(struct wpas_dbus_priv *priv,
DBusTimeout *timeout)
{
eloop_cancel_timeout(process_timeout, priv, timeout);
dbus_timeout_set_data(timeout, NULL, NULL);
}
static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data)
{
if (!dbus_timeout_get_enabled(timeout))
return TRUE;
connection_setup_add_timeout(data, timeout);
return TRUE;
}
static void remove_timeout(DBusTimeout *timeout, void *data)
{
connection_setup_remove_timeout(data, timeout);
}
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 process_wakeup_main(int sig, void *signal_ctx)
{
struct wpas_dbus_priv *priv = signal_ctx;
if (sig != SIGPOLL || !priv->con)
return;
if (dbus_connection_get_dispatch_status(priv->con) !=
DBUS_DISPATCH_DATA_REMAINS)
return;
/* Only dispatch once - we do not want to starve other events */
dbus_connection_ref(priv->con);
dbus_connection_dispatch(priv->con);
dbus_connection_unref(priv->con);
}
/**
* wakeup_main - Attempt to wake our mainloop up
* @data: dbus control interface private data
*
* Try to wake up the main eloop so it will process
* dbus events that may have happened.
*/
static void wakeup_main(void *data)
{
struct wpas_dbus_priv *priv = data;
/* Use SIGPOLL to break out of the eloop select() */
raise(SIGPOLL);
priv->should_dispatch = 1;
}
/**
* connection_setup_wakeup_main - Tell dbus about our wakeup_main function
* @priv: dbus control interface private data
* Returns: 0 on success, -1 on failure
*
* Register our wakeup_main handler with dbus
*/
static int connection_setup_wakeup_main(struct wpas_dbus_priv *priv)
{
if (eloop_register_signal(SIGPOLL, process_wakeup_main, priv))
return -1;
dbus_connection_set_wakeup_main_function(priv->con, wakeup_main,
priv, NULL);
return 0;
}
/**
* integrate_with_eloop - Register our mainloop integration with dbus
* @connection: connection to the system message bus
* @priv: a dbus control interface data structure
* Returns: 0 on success, -1 on failure
*
* We register our mainloop integration functions with dbus here.
*/
static int integrate_with_eloop(struct wpas_dbus_priv *priv)
{
if (!dbus_connection_set_watch_functions(priv->con, add_watch,
remove_watch, watch_toggled,
priv, NULL)) {
perror("dbus_connection_set_watch_functions[dbus]");
wpa_printf(MSG_ERROR, "Not enough memory to set up dbus.");
return -1;
}
if (!dbus_connection_set_timeout_functions(priv->con, add_timeout,
remove_timeout,
timeout_toggled, priv,
NULL)) {
perror("dbus_connection_set_timeout_functions[dbus]");
wpa_printf(MSG_ERROR, "Not enough memory to set up dbus.");
return -1;
}
if (connection_setup_wakeup_main(priv) < 0) {
perror("connection_setup_wakeup_main[dbus]");
wpa_printf(MSG_ERROR, "Could not setup main wakeup function.");
return -1;
}
return 0;
}
static int wpas_dbus_init_common(struct wpas_dbus_priv *priv)
{
DBusError error;
/* Get a reference to the system bus */
dbus_error_init(&error);
priv->con = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
dbus_error_free(&error);
if (!priv->con) {
wpa_printf(MSG_ERROR, "dbus: Could not acquire the system "
"bus: %s", strerror(errno));
return -1;
}
return 0;
}
static int wpas_dbus_init_common_finish(struct wpas_dbus_priv *priv)
{
/* Tell dbus about our mainloop integration functions */
integrate_with_eloop(priv);
/*
* Dispatch initial DBus messages that may have come in since the bus
* name was claimed above. Happens when clients are quick to notice the
* service.
*
* FIXME: is there a better solution to this problem?
*/
eloop_register_timeout(0, 50, dispatch_initial_dbus_messages,
priv->con, NULL);
return 0;
}
static void wpas_dbus_deinit_common(struct wpas_dbus_priv *priv)
{
if (priv->con) {
eloop_cancel_timeout(dispatch_initial_dbus_messages,
priv->con, NULL);
dbus_connection_set_watch_functions(priv->con, NULL, NULL,
NULL, NULL, NULL);
dbus_connection_set_timeout_functions(priv->con, NULL, NULL,
NULL, NULL, NULL);
dbus_connection_unref(priv->con);
}
os_free(priv);
}
struct wpas_dbus_priv * wpas_dbus_init(struct wpa_global *global)
{
struct wpas_dbus_priv *priv;
priv = os_zalloc(sizeof(*priv));
if (priv == NULL)
return NULL;
priv->global = global;
if (wpas_dbus_init_common(priv) < 0) {
wpas_dbus_deinit(priv);
return NULL;
}
#ifdef CONFIG_CTRL_IFACE_DBUS_NEW
if (wpas_dbus_ctrl_iface_init(priv) < 0) {
wpas_dbus_deinit(priv);
return NULL;
}
#endif /* CONFIG_CTRL_IFACE_DBUS_NEW */
#ifdef CONFIG_CTRL_IFACE_DBUS
if (wpa_supplicant_dbus_ctrl_iface_init(priv) < 0) {
wpas_dbus_deinit(priv);
return NULL;
}
#endif /* CONFIG_CTRL_IFACE_DBUS */
if (wpas_dbus_init_common_finish(priv) < 0) {
wpas_dbus_deinit(priv);
return NULL;
}
return priv;
}
void wpas_dbus_deinit(struct wpas_dbus_priv *priv)
{
if (priv == NULL)
return;
#ifdef CONFIG_CTRL_IFACE_DBUS_NEW
wpas_dbus_ctrl_iface_deinit(priv);
#endif /* CONFIG_CTRL_IFACE_DBUS_NEW */
#ifdef CONFIG_CTRL_IFACE_DBUS
/* TODO: is any deinit needed? */
#endif /* CONFIG_CTRL_IFACE_DBUS */
wpas_dbus_deinit_common(priv);
}