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// SPDX-License-Identifier: LGPL-2.1+
/*
* Copyright 2013 Red Hat, Inc.
*/
#include "nm-default.h"
#include "nm-dbus-helpers.h"
#include "nm-dbus-interface.h"
static GBusType nm_bus = G_BUS_TYPE_SYSTEM;
GBusType
_nm_dbus_bus_type (void)
{
static gsize init_value = 0;
if (g_once_init_enter (&init_value)) {
if (g_getenv ("LIBNM_USE_SESSION_BUS"))
nm_bus = G_BUS_TYPE_SESSION;
g_once_init_leave (&init_value, 1);
}
return nm_bus;
}
/* D-Bus has an upper limit on number of Match rules and it's rather easy
* to hit as the proxy likes to add one for each object. Let's remove the Match
* rule the proxy added and ensure a less granular rule is present instead.
*
* Also, don't do this immediately since it has a performance penalty.
* Still better than losing the signals altogether.
*
* Ideally, we should be able to tell glib not to hook its rules:
* https://bugzilla.gnome.org/show_bug.cgi?id=758749
*/
void
_nm_dbus_proxy_replace_match (GDBusProxy *proxy)
{
GDBusConnection *connection = g_dbus_proxy_get_connection (proxy);
static unsigned match_counter = 1024;
char *match;
if (match_counter == 1) {
/* If we hit the low matches watermark, install a
* less granular one. */
g_dbus_connection_call (connection,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"AddMatch",
g_variant_new ("(s)", "type='signal',sender='" NM_DBUS_SERVICE "'"),
NULL,
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
NULL,
NULL);
}
if (match_counter)
match_counter--;
if (match_counter)
return;
/* Remove what this proxy added. */
match = g_strdup_printf ("type='signal',sender='" NM_DBUS_SERVICE "',"
"interface='%s',path='%s'",
g_dbus_proxy_get_interface_name (proxy),
g_dbus_proxy_get_object_path (proxy));
g_dbus_connection_call (connection,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"RemoveMatch",
g_variant_new ("(s)", match),
NULL,
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
NULL,
NULL);
g_free (match);
}
/* Binds the properties on a generated server-side GDBus object to the
* corresponding properties on the public object.
*/
void
_nm_dbus_bind_properties (gpointer object, gpointer skeleton)
{
GParamSpec **properties;
guint n_properties;
int i;
properties = g_object_class_list_properties (G_OBJECT_GET_CLASS (skeleton), &n_properties);
for (i = 0; i < n_properties; i++) {
if (g_str_has_prefix (properties[i]->name, "g-"))
continue;
g_object_bind_property (object, properties[i]->name,
skeleton, properties[i]->name,
G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
}
g_free (properties);
}
static char *
signal_name_from_method_name (const char *method_name)
{
GString *signal_name;
const char *p;
signal_name = g_string_new ("handle");
for (p = method_name; *p; p++) {
if (g_ascii_isupper (*p))
g_string_append_c (signal_name, '-');
g_string_append_c (signal_name, g_ascii_tolower (*p));
}
return g_string_free (signal_name, FALSE);
}
static void
_nm_dbus_method_meta_marshal (GClosure *closure, GValue *return_value,
guint n_param_values, const GValue *param_values,
gpointer invocation_hint, gpointer marshal_data)
{
closure->marshal (closure, return_value, n_param_values,
param_values, invocation_hint,
((GCClosure *)closure)->callback);
g_value_set_boolean (return_value, TRUE);
}
/* Takes (method_name, handler_func) pairs and connects the handlers to the
* signals on skeleton, with object as the user_data, but swapped so it comes
* first in the argument list, and handling the return value automatically.
*/
void
_nm_dbus_bind_methods (gpointer object, gpointer skeleton, ...)
{
va_list ap;
const char *method_name;
char *signal_name;
GCallback handler;
GClosure *closure;
va_start (ap, skeleton);
while ( (method_name = va_arg (ap, const char *))
&& (handler = va_arg (ap, GCallback))) {
signal_name = signal_name_from_method_name (method_name);
closure = g_cclosure_new_swap (handler, object, NULL);
g_closure_set_meta_marshal (closure, NULL, _nm_dbus_method_meta_marshal);
g_signal_connect_closure (skeleton, signal_name, closure, FALSE);
g_free (signal_name);
}
va_end (ap);
}
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