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dbus: Terminate cleanly on messagebus shutdown

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By default, dbus_connection_dispatch() will call _exit() if the bus
connection has been closed. This caused wpa_supplicant to terminate
without properly cleaning up after itself.

To ensure that we terminate cleanly when the messagebus terminates,
override the exit_on_disconnect behavior and install a filter to handle
libdbus's "Disconnected" signal.

[Bug 474]

Signed-hostap: Daniel Gnoutcheff <daniel@gnoutcheff.name>
This commit is contained in:
Daniel Gnoutcheff 2013-05-16 20:47:28 +03:00 committed by Jouni Malinen
parent e2396a684e
commit d7692b8d1c
1 changed files with 24 additions and 1 deletions
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25
wpa_supplicant/dbus/dbus_common.c
View file

@ -17,6 +17,7 @@
#include "dbus_common_i.h"
#include "dbus_new.h"
#include "dbus_old.h"
#include "../wpa_supplicant_i.h"
#ifndef SIGPOLL
@ -257,6 +258,22 @@ static int integrate_with_eloop(struct wpas_dbus_priv *priv)
}
static DBusHandlerResult disconnect_filter(DBusConnection *conn,
DBusMessage *message, void *data)
{
struct wpas_dbus_priv *priv = data;
if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL,
"Disconnected")) {
wpa_printf(MSG_DEBUG, "dbus: bus disconnected, terminating");
dbus_connection_set_exit_on_disconnect(conn, FALSE);
wpa_supplicant_terminate_proc(priv->global);
return DBUS_HANDLER_RESULT_HANDLED;
} else
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
static int wpas_dbus_init_common(struct wpas_dbus_priv *priv)
{
DBusError error;
@ -265,7 +282,10 @@ static int wpas_dbus_init_common(struct wpas_dbus_priv *priv)
/* Get a reference to the system bus */
dbus_error_init(&error);
priv->con = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
if (!priv->con) {
if (priv->con) {
dbus_connection_add_filter(priv->con, disconnect_filter, priv,
NULL);
} else {
wpa_printf(MSG_ERROR, "dbus: Could not acquire the system "
"bus: %s - %s", error.name, error.message);
ret = -1;
@ -304,6 +324,9 @@ static void wpas_dbus_deinit_common(struct wpas_dbus_priv *priv)
NULL, NULL, NULL);
dbus_connection_set_timeout_functions(priv->con, NULL, NULL,
NULL, NULL, NULL);
dbus_connection_remove_filter(priv->con, disconnect_filter,
priv);
dbus_connection_unref(priv->con);
}