NetworkManager/src/core/nm-dbus-utils.c

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2018 Red Hat, Inc.
 */

#include "src/core/nm-default-daemon.h"

#include "nm-dbus-utils.h"

#include "nm-dbus-object.h"

/*****************************************************************************/

GDBusPropertyInfo *
nm_dbus_utils_interface_info_lookup_property(const GDBusInterfaceInfo *interface_info,
                                             const char               *property_name,
                                             guint                    *property_idx)
{
    guint i;

    nm_assert(interface_info);
    nm_assert(property_name);

    /* there is also g_dbus_interface_info_lookup_property(), however that makes use
     * of a global cache. */
    if (interface_info->properties) {
        for (i = 0; interface_info->properties[i]; i++) {
            GDBusPropertyInfo *info = interface_info->properties[i];

            if (nm_streq(info->name, property_name)) {
                NM_SET_OUT(property_idx, i);
                return info;
            }
        }
    }

    return NULL;
}

GDBusMethodInfo *
nm_dbus_utils_interface_info_lookup_method(const GDBusInterfaceInfo *interface_info,
                                           const char               *method_name)
{
    guint i;

    nm_assert(interface_info);
    nm_assert(method_name);

    /* there is also g_dbus_interface_info_lookup_property(), however that makes use
     * of a global cache. */
    if (interface_info->methods) {
        for (i = 0; interface_info->methods[i]; i++) {
            GDBusMethodInfo *info = interface_info->methods[i];

            if (nm_streq(info->name, method_name))
                return info;
        }
    }

    return NULL;
}

GVariant *
nm_dbus_utils_get_property(GObject *obj, const char *signature, const char *property_name)
{
    nm_auto_unset_gvalue GValue value = G_VALUE_INIT;
    GParamSpec                 *pspec;
    GVariant                   *variant;

    nm_assert(G_IS_OBJECT(obj));
    nm_assert(g_variant_type_string_is_valid(signature));
    nm_assert(property_name && property_name[0]);

    pspec = g_object_class_find_property(G_OBJECT_GET_CLASS(obj), property_name);

    nm_assert(pspec);

    nm_assert(pspec->value_type != G_TYPE_VARIANT
              || nm_streq((char *) (((GParamSpecVariant *) pspec)->type), signature));

    g_value_init(&value, pspec->value_type);

    g_object_get_property(obj, property_name, &value);

    variant = g_dbus_gvalue_to_gvariant(&value, G_VARIANT_TYPE(signature));

    nm_assert(!variant || g_variant_is_of_type(variant, G_VARIANT_TYPE(signature)));

    /* returns never-floating variant */
    nm_assert(!variant || !g_variant_is_floating(variant));

    return variant;
}

/*****************************************************************************/

void
nm_dbus_utils_g_value_set_object_path(GValue *value, gpointer object)
{
    g_value_set_string(value, object ? nm_dbus_object_get_path(object) : NULL);
}

void
nm_dbus_utils_g_value_set_object_path_still_exported(GValue *value, gpointer object)
{
    g_value_set_string(value, object ? nm_dbus_object_get_path_still_exported(object) : "/");
}

void
nm_dbus_utils_g_value_set_object_path_from_hash(
    GValue     *value,
    GHashTable *hash /* has keys of NMDBusObject type. */,
    gboolean    expect_all_exported)
{
    NMDBusObject  *obj;
    char         **strv;
    guint          i, n;
    GHashTableIter iter;

    nm_assert(value);
    nm_assert(hash);

    n    = g_hash_table_size(hash);
    strv = g_new(char *, n + 1);
    i    = 0;
    g_hash_table_iter_init(&iter, hash);
    while (g_hash_table_iter_next(&iter, (gpointer *) &obj, NULL)) {
        const char *path;

        path = nm_dbus_object_get_path_still_exported(obj);
        if (!path) {
            nm_assert(!expect_all_exported);
            continue;
        }
        strv[i++] = g_strdup(path);
    }
    nm_assert(i <= n);
    strv[i] = NULL;

    /* sort the names, to give a well-defined, stable order. */
    nm_strv_sort(strv, i);

    g_value_take_boxed(value, strv);
}

const char **
nm_dbus_utils_get_paths_for_clist(const CList *lst_head,
                                  gssize       lst_len,
                                  guint        member_offset,
                                  gboolean     expect_all_exported)
{
    const CList *iter;
    const char **strv;
    const char  *path;
    gsize        i, n;

    nm_assert(lst_head);

    if (lst_len < 0)
        n = c_list_length(lst_head);
    else {
        n = lst_len;
        nm_assert(n == c_list_length(lst_head));
    }

    i    = 0;
    strv = g_new(const char *, n + 1);
    c_list_for_each (iter, lst_head) {
        NMDBusObject *obj = (NMDBusObject *) (((const char *) iter) - member_offset);

        path = nm_dbus_object_get_path(obj);
        if (!path) {
            nm_assert(expect_all_exported);
            continue;
        }

        nm_assert(i < n);
        strv[i++] = path;
    }
    nm_assert(i <= n);
    strv[i] = NULL;

    return strv;
}

/*****************************************************************************/

void
nm_dbus_track_obj_path_init(NMDBusTrackObjPath *track, GObject *target, const GParamSpec *pspec)
{
    nm_assert(track);
    nm_assert(G_IS_OBJECT(target));
    nm_assert(G_IS_PARAM_SPEC(pspec));

    track->_obj              = NULL;
    track->_notify_target    = target;
    track->_notify_pspec     = pspec;
    track->_notify_signal_id = 0;
    track->_visible          = FALSE;
}

void
nm_dbus_track_obj_path_deinit(NMDBusTrackObjPath *track)
{
    /* we allow deinit() to be called multiple times (e.g. from
     * dispose(), which must be re-entrant). */
    nm_assert(track);
    nm_assert(!track->_notify_target || G_IS_OBJECT(track->_notify_target));

    nm_clear_g_signal_handler(track->obj, &track->_notify_signal_id);
    track->_notify_target = NULL;
    track->_notify_pspec  = NULL;
    track->_visible       = FALSE;
    nm_clear_g_object(&track->_obj);
}

void
nm_dbus_track_obj_path_notify(const NMDBusTrackObjPath *track)
{
    nm_assert(track);
    nm_assert(G_IS_OBJECT(track->_notify_target));
    nm_assert(G_IS_PARAM_SPEC(track->_notify_pspec));

    g_object_notify_by_pspec(track->_notify_target, (GParamSpec *) track->_notify_pspec);
}

const char *
nm_dbus_track_obj_path_get(const NMDBusTrackObjPath *track)
{
    nm_assert(track);
    nm_assert(G_IS_OBJECT(track->_notify_target));

    return track->obj && track->visible ? nm_dbus_object_get_path_still_exported(track->obj) : NULL;
}

static void
_track_obj_exported_changed(NMDBusObject *obj, NMDBusTrackObjPath *track)
{
    nm_dbus_track_obj_path_notify(track);
}

void
nm_dbus_track_obj_path_set(NMDBusTrackObjPath *track, gpointer obj, gboolean visible)
{
    gs_unref_object NMDBusObject *old_obj = NULL;
    const char                   *old_path;

    nm_assert(track);
    nm_assert(G_IS_OBJECT(track->_notify_target));

    g_return_if_fail(!obj || NM_IS_DBUS_OBJECT(obj));

    if (track->obj == obj && track->visible == !!visible)
        return;

    old_path = nm_dbus_track_obj_path_get(track);

    track->_visible = visible;

    if (track->obj != obj) {
        nm_clear_g_signal_handler(track->obj, &track->_notify_signal_id);

        old_obj     = track->obj;
        track->_obj = nm_g_object_ref(obj);

        if (obj) {
            track->_notify_signal_id = g_signal_connect(obj,
                                                        NM_DBUS_OBJECT_EXPORTED_CHANGED,
                                                        G_CALLBACK(_track_obj_exported_changed),
                                                        track);
        }
    }

    if (!nm_streq0(old_path, nm_dbus_track_obj_path_get(track)))
        nm_dbus_track_obj_path_notify(track);
}