/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2013 - 2014 Red Hat, Inc.
 */

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

#include "nm-bluez-manager.h"

#include <signal.h>
#include <stdlib.h>
#include <gmodule.h>
#include <linux/if_ether.h>

#include "libnm-glib-aux/nm-uuid.h"
#include "libnm-glib-aux/nm-dbus-aux.h"
#include "libnm-glib-aux/nm-c-list.h"
#include "nm-dbus-manager.h"
#include "devices/nm-device-factory.h"
#include "devices/nm-device-bridge.h"
#include "nm-setting-bluetooth.h"
#include "settings/nm-settings.h"
#include "nm-bluez-common.h"
#include "nm-device-bt.h"
#include "nm-manager.h"
#include "nm-bluez5-dun.h"
#include "libnm-core-intern/nm-core-internal.h"
#include "libnm-platform/nm-platform.h"
#include "libnm-std-aux/nm-dbus-compat.h"

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

#if WITH_BLUEZ5_DUN
#define _NM_BT_CAPABILITY_SUPPORTED_DUN NM_BT_CAPABILITY_DUN
#else
#define _NM_BT_CAPABILITY_SUPPORTED_DUN NM_BT_CAPABILITY_NONE
#endif
#define _NM_BT_CAPABILITY_SUPPORTED (NM_BT_CAPABILITY_NAP | _NM_BT_CAPABILITY_SUPPORTED_DUN)

typedef struct {
    const char             *bdaddr;
    CList                   lst_head;
    NMBluetoothCapabilities bt_type : 8;
    char                    bdaddr_data[];
} ConnDataHead;

typedef struct {
    NMSettingsConnection *sett_conn;
    ConnDataHead         *cdata_hd;
    CList                 lst;
} ConnDataElem;

typedef struct {
    GCancellable              *ext_cancellable;
    GCancellable              *int_cancellable;
    NMBtVTableRegisterCallback callback;
    gpointer                   callback_user_data;
    gulong                     ext_cancelled_id;
} NetworkServerRegisterReqData;

typedef struct {
    GCancellable           *ext_cancellable;
    GCancellable           *int_cancellable;
    NMBluezManagerConnectCb callback;
    gpointer                callback_user_data;
    char                   *device_name;
    gulong                  ext_cancelled_id;
    guint                   timeout_id;
    guint                   timeout_wait_connect_id;
} DeviceConnectReqData;

typedef struct {
    const char *object_path;

    NMBluezManager *self;

    /* Fields name with "d_" prefix are purely cached values from BlueZ's
     * ObjectManager D-Bus interface. There is no logic whatsoever about
     * them.
     */

    CList process_change_lst;

    struct {
        char *address;
    } d_adapter;

    struct {
        char *address;
        char *name;
        char *adapter;
    } d_device;

    struct {
        char *interface;
    } d_network;

    struct {
        CList                         lst;
        char                         *adapter_address;
        NMDevice                     *device_br;
        NetworkServerRegisterReqData *r_req_data;
    } x_network_server;

    struct {
        NMSettingsConnection *panu_connection;
        NMDeviceBt           *device_bt;
        DeviceConnectReqData *c_req_data;
        NMBluez5DunContext   *connect_dun_context;
        gulong                device_bt_signal_id;
    } x_device;

    /* indicate whether the D-Bus object has the particular D-Bus interface. */
    bool d_has_adapter_iface : 1;
    bool d_has_device_iface : 1;
    bool d_has_network_iface : 1;
    bool d_has_network_server_iface : 1;

    /* cached D-Bus properties for Device1 ("d_device*"). */
    NMBluetoothCapabilities d_device_capabilities : 6;
    bool                    d_device_connected : 1;
    bool                    d_device_paired : 1;

    /* cached D-Bus properties for Network1 ("d_network*"). */
    bool d_network_connected : 1;

    /* cached D-Bus properties for Adapter1 ("d_adapter*"). */
    bool d_adapter_powered : 1;

    /* properties related to device ("x_device*"). */
    NMBluetoothCapabilities x_device_connect_bt_type : 6;
    bool                    x_device_is_usable : 1;
    bool                    x_device_is_connected : 1;

    bool x_device_panu_connection_allow_create : 1;

    /* flag to remember last time when we checked wether the object
     * was  a suitable adapter that is usable to a device. */
    bool was_usable_adapter_for_device_before : 1;

    char _object_path_intern[];
} BzDBusObj;

typedef struct {
    NMManager  *manager;
    NMSettings *settings;

    GDBusConnection *dbus_connection;

    NMBtVTableNetworkServer vtable_network_server;

    GCancellable *name_owner_get_cancellable;
    GCancellable *get_managed_objects_cancellable;

    GHashTable *bzobjs;

    char *name_owner;

    GHashTable *conn_data_heads;
    GHashTable *conn_data_elems;

    CList network_server_lst_head;

    CList process_change_lst_head;

    guint name_owner_changed_id;

    guint managed_objects_changed_id;

    guint properties_changed_id;

    guint process_change_idle_id;

    bool settings_registered : 1;
} NMBluezManagerPrivate;

struct _NMBluezManager {
    NMDeviceFactory       parent;
    NMBluezManagerPrivate _priv;
};

struct _NMBluezManagerClass {
    NMDeviceFactoryClass parent;
};

G_DEFINE_TYPE(NMBluezManager, nm_bluez_manager, NM_TYPE_DEVICE_FACTORY);

#define NM_BLUEZ_MANAGER_GET_PRIVATE(self) \
    _NM_GET_PRIVATE(self, NMBluezManager, NM_IS_BLUEZ_MANAGER)

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

NM_DEVICE_FACTORY_DECLARE_TYPES(NM_DEVICE_FACTORY_DECLARE_LINK_TYPES(
    NM_LINK_TYPE_BNEP) NM_DEVICE_FACTORY_DECLARE_SETTING_TYPES(NM_SETTING_BLUETOOTH_SETTING_NAME))

G_MODULE_EXPORT NMDeviceFactory *
nm_device_factory_create(GError **error)
{
    return g_object_new(NM_TYPE_BLUEZ_MANAGER, NULL);
}

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

#define _NMLOG_DOMAIN      LOGD_BT
#define _NMLOG(level, ...) __NMLOG_DEFAULT(level, _NMLOG_DOMAIN, "bluez", __VA_ARGS__)

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

static NMBluetoothCapabilities
convert_uuids_to_capabilities(const char *const *strv)
{
    NMBluetoothCapabilities capabilities = NM_BT_CAPABILITY_NONE;

    if (strv) {
        for (; strv[0]; strv++) {
            gs_free char *s_part1 = NULL;
            const char   *str     = strv[0];
            const char   *s;

            s = strchr(str, '-');
            if (!s)
                continue;

            s_part1 = g_strndup(str, s - str);
            switch (_nm_utils_ascii_str_to_int64(s_part1, 16, 0, G_MAXINT, -1)) {
            case 0x1103:
                capabilities |= NM_BT_CAPABILITY_DUN;
                break;
            case 0x1116:
                capabilities |= NM_BT_CAPABILITY_NAP;
                break;
            default:
                break;
            }
        }
    }

    return capabilities;
}

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

static void     _cleanup_for_name_owner(NMBluezManager *self);
static void     _connect_disconnect(NMBluezManager *self, BzDBusObj *bzobj, const char *reason);
static gboolean _bzobjs_network_server_is_usable(const BzDBusObj *bzobj, gboolean require_powered);
static gboolean _bzobjs_is_dead(const BzDBusObj *bzobj);
static gboolean _bzobjs_device_is_usable(const BzDBusObj *bzobj,
                                         BzDBusObj      **out_adapter_bzobj,
                                         gboolean        *out_create_panu_connection);
static gboolean _bzobjs_adapter_is_usable_for_device(const BzDBusObj *bzobj);
static ConnDataHead *
_conn_track_find_head(NMBluezManager *self, NMBluetoothCapabilities bt_type, const char *bdaddr);
static void _process_change_idle_schedule(NMBluezManager *self, BzDBusObj *bzobj);
static void
_network_server_unregister_bridge(NMBluezManager *self, BzDBusObj *bzobj, const char *reason);
static gboolean _connect_timeout_wait_connected_cb(gpointer user_data);

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

static void
_dbus_call_complete_cb_nop(GObject *source_object, GAsyncResult *res, gpointer user_data)
{
    /* we don't do anything at all. The only reason to register this
     * callback is so that GDBusConnection keeps the cancellable alive
     * long enough until the call completes.
     *
     * Note that this cancellable in turn is registered via
     * nm_shutdown_wait_obj_register_*(), to block shutdown until
     * we are done. */
}

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

static void
_network_server_register_req_data_complete(NetworkServerRegisterReqData *r_req_data, GError *error)
{
    nm_clear_g_signal_handler(r_req_data->ext_cancellable, &r_req_data->ext_cancelled_id);

    nm_clear_g_cancellable(&r_req_data->int_cancellable);

    if (r_req_data->callback) {
        gs_free_error GError *error_cancelled = NULL;

        if (g_cancellable_set_error_if_cancelled(r_req_data->ext_cancellable, &error_cancelled))
            error = error_cancelled;

        r_req_data->callback(error, r_req_data->callback_user_data);
    }

    g_object_unref(r_req_data->ext_cancellable);
    nm_g_slice_free(r_req_data);
}

static void
_device_connect_req_data_complete(DeviceConnectReqData *c_req_data,
                                  NMBluezManager       *self,
                                  const char           *device_name,
                                  GError               *error)
{
    nm_assert((!!device_name) != (!!error));

    nm_clear_g_signal_handler(c_req_data->ext_cancellable, &c_req_data->ext_cancelled_id);

    nm_clear_g_cancellable(&c_req_data->int_cancellable);
    nm_clear_g_source(&c_req_data->timeout_id);
    nm_clear_g_source(&c_req_data->timeout_wait_connect_id);

    if (c_req_data->callback) {
        gs_free_error GError *error_cancelled = NULL;

        if (g_cancellable_set_error_if_cancelled(c_req_data->ext_cancellable, &error_cancelled)) {
            error       = error_cancelled;
            device_name = NULL;
        }

        c_req_data->callback(self, TRUE, device_name, error, c_req_data->callback_user_data);
    }

    g_object_unref(c_req_data->ext_cancellable);
    nm_clear_g_free(&c_req_data->device_name);
    nm_g_slice_free(c_req_data);
}

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

static BzDBusObj *
_bz_dbus_obj_new(NMBluezManager *self, const char *object_path)
{
    BzDBusObj *bzobj;
    gsize      l;

    nm_assert(NM_IS_BLUEZ_MANAGER(self));

    l = strlen(object_path) + 1;

    bzobj  = g_malloc(sizeof(BzDBusObj) + l);
    *bzobj = (BzDBusObj){
        .object_path                           = bzobj->_object_path_intern,
        .self                                  = self,
        .x_network_server.lst                  = C_LIST_INIT(bzobj->x_network_server.lst),
        .process_change_lst                    = C_LIST_INIT(bzobj->process_change_lst),
        .x_device_panu_connection_allow_create = TRUE,
    };
    memcpy(bzobj->_object_path_intern, object_path, l);

    return bzobj;
}

static void
_bz_dbus_obj_free(BzDBusObj *bzobj)
{
    nm_assert(bzobj);
    nm_assert(NM_IS_BLUEZ_MANAGER(bzobj->self));
    nm_assert(!bzobj->x_network_server.device_br);
    nm_assert(!bzobj->x_network_server.r_req_data);
    nm_assert(!bzobj->x_device.c_req_data);

    c_list_unlink_stale(&bzobj->process_change_lst);
    c_list_unlink_stale(&bzobj->x_network_server.lst);
    g_free(bzobj->x_network_server.adapter_address);
    g_free(bzobj->d_adapter.address);
    g_free(bzobj->d_network.interface);
    g_free(bzobj->d_device.address);
    g_free(bzobj->d_device.name);
    g_free(bzobj->d_device.adapter);
    g_free(bzobj);
}

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

static const char *
_bzobj_to_string(const BzDBusObj *bzobj, char *buf, gsize len)
{
    char       *buf0   = buf;
    const char *prefix = "";
    gboolean    device_is_usable;
    gboolean    create_panu_connection = FALSE;
    gboolean    network_server_is_usable;
    char        sbuf_cap[100];

    if (len > 0)
        buf[0] = '\0';

    if (bzobj->d_has_adapter_iface) {
        nm_strbuf_append_str(&buf, &len, prefix);
        prefix = ", ";
        nm_strbuf_append_str(&buf, &len, "Adapter1 {");
        if (bzobj->d_adapter.address) {
            nm_strbuf_append(&buf, &len, " d.address: \"%s\"", bzobj->d_adapter.address);
            if (bzobj->d_adapter_powered)
                nm_strbuf_append_str(&buf, &len, ",");
        }
        if (bzobj->d_adapter_powered)
            nm_strbuf_append(&buf, &len, " d.powered: 1");
        nm_strbuf_append_str(&buf, &len, " }");
    }

    if (bzobj->d_has_device_iface) {
        const char *prefix1 = "";

        nm_strbuf_append_str(&buf, &len, prefix);
        prefix = ", ";
        nm_strbuf_append_str(&buf, &len, "Device1 {");
        if (bzobj->d_device.address) {
            nm_strbuf_append(&buf, &len, "%s d.address: \"%s\"", prefix1, bzobj->d_device.address);
            prefix1 = ",";
        }
        if (bzobj->d_device.name) {
            nm_strbuf_append(&buf, &len, "%s d.name: \"%s\"", prefix1, bzobj->d_device.name);
            prefix1 = ",";
        }
        if (bzobj->d_device.adapter) {
            nm_strbuf_append(&buf, &len, "%s d.adapter: \"%s\"", prefix1, bzobj->d_device.adapter);
            prefix1 = ",";
        }
        if (bzobj->d_device_capabilities != NM_BT_CAPABILITY_NONE) {
            nm_strbuf_append(&buf,
                             &len,
                             "%s d.capabilities: \"%s\"",
                             prefix1,
                             nm_bluetooth_capability_to_string(bzobj->d_device_capabilities,
                                                               sbuf_cap,
                                                               sizeof(sbuf_cap)));
            prefix1 = ",";
        }
        if (bzobj->d_device_connected) {
            nm_strbuf_append(&buf, &len, "%s d.connected: 1", prefix1);
            prefix1 = ",";
        }
        if (bzobj->d_device_paired) {
            nm_strbuf_append(&buf, &len, "%s d.paired: 1", prefix1);
            prefix1 = ",";
        }
        nm_strbuf_append_str(&buf, &len, " }");
    }

    network_server_is_usable = _bzobjs_network_server_is_usable(bzobj, TRUE);

    if (bzobj->d_has_network_server_iface
        || network_server_is_usable != (!c_list_is_empty(&bzobj->x_network_server.lst))
        || !c_list_is_empty(&bzobj->x_network_server.lst)
        || !nm_streq0(bzobj->d_has_adapter_iface ? bzobj->d_adapter.address : NULL,
                      bzobj->x_network_server.adapter_address)
        || bzobj->x_network_server.device_br || bzobj->x_network_server.r_req_data) {
        nm_strbuf_append_str(&buf, &len, prefix);
        prefix = ", ";

        nm_strbuf_append(&buf, &len, "NetworkServer1 { ");

        if (!bzobj->d_has_network_server_iface)
            nm_strbuf_append(&buf, &len, " has-d-iface: 0, ");

        if (network_server_is_usable != (!c_list_is_empty(&bzobj->x_network_server.lst)))
            nm_strbuf_append(&buf,
                             &len,
                             "usable: %d, used: %d",
                             !!network_server_is_usable,
                             !network_server_is_usable);
        else if (network_server_is_usable)
            nm_strbuf_append(&buf, &len, "used: 1");
        else
            nm_strbuf_append(&buf, &len, "usable: 0");

        if (!nm_streq0(bzobj->d_has_adapter_iface ? bzobj->d_adapter.address : NULL,
                       bzobj->x_network_server.adapter_address)) {
            if (bzobj->x_network_server.adapter_address)
                nm_strbuf_append(&buf,
                                 &len,
                                 ", adapter-address: \"%s\"",
                                 bzobj->x_network_server.adapter_address);
            else
                nm_strbuf_append(&buf, &len, ", adapter-address: <NULL>");
        }

        if (bzobj->x_network_server.device_br)
            nm_strbuf_append(&buf, &len, ", bridge-device: 1");

        if (bzobj->x_network_server.r_req_data)
            nm_strbuf_append(&buf, &len, ", register-in-progress: 1");

        nm_strbuf_append_str(&buf, &len, " }");
    }

    device_is_usable = _bzobjs_device_is_usable(bzobj, NULL, &create_panu_connection);

    if (bzobj->d_has_network_iface || bzobj->d_network.interface || bzobj->d_network_connected
        || create_panu_connection || bzobj->x_device.panu_connection
        || device_is_usable != bzobj->x_device_is_usable || bzobj->x_device.device_bt
        || bzobj->x_device_connect_bt_type != NM_BT_CAPABILITY_NONE
        || bzobj->x_device.connect_dun_context || bzobj->x_device.c_req_data
        || bzobj->x_device_is_connected != bzobj->d_network_connected) {
        nm_strbuf_append_str(&buf, &len, prefix);
        prefix = ", ";
        nm_strbuf_append_str(&buf, &len, "Network1 {");
        if (bzobj->d_network.interface)
            nm_strbuf_append(&buf, &len, " d.interface: \"%s\", ", bzobj->d_network.interface);
        if (bzobj->d_network_connected)
            nm_strbuf_append(&buf, &len, " d.connected: %d, ", !!bzobj->d_network_connected);
        if (!bzobj->d_has_network_iface)
            nm_strbuf_append(&buf, &len, " has-d-iface: 0, ");
        if (device_is_usable != bzobj->x_device_is_usable)
            nm_strbuf_append(&buf,
                             &len,
                             " usable: %d, used: %d",
                             !!device_is_usable,
                             !device_is_usable);
        else if (device_is_usable)
            nm_strbuf_append(&buf, &len, " used: 1");
        else
            nm_strbuf_append(&buf, &len, " usable: 0");

        if (create_panu_connection)
            nm_strbuf_append(&buf, &len, ", create-panu-connection: 1");

        if (bzobj->x_device.panu_connection)
            nm_strbuf_append(&buf, &len, ", has-panu-connection: 1");

        if (bzobj->x_device.device_bt)
            nm_strbuf_append(&buf, &len, ", has-device: 1");

        if (bzobj->x_device_connect_bt_type != NM_BT_CAPABILITY_NONE
            || bzobj->x_device.connect_dun_context) {
            nm_strbuf_append(&buf,
                             &len,
                             ", connect: %s%s",
                             nm_bluetooth_capability_to_string(bzobj->x_device_connect_bt_type,
                                                               sbuf_cap,
                                                               sizeof(sbuf_cap)),
                             bzobj->x_device.connect_dun_context ? ",with-dun-context" : "");
        }

        if (bzobj->x_device.c_req_data)
            nm_strbuf_append(&buf, &len, ", connecting: 1");

        if (bzobj->x_device_is_connected != bzobj->d_network_connected)
            nm_strbuf_append(&buf, &len, ", connected: %d", !!bzobj->x_device_is_connected);

        nm_strbuf_append_str(&buf, &len, " }");
    }

    if (_bzobjs_is_dead(bzobj)) {
        nm_strbuf_append_str(&buf, &len, prefix);
        prefix = ", ";
        nm_strbuf_append_str(&buf, &len, "dead: 1");
    }

    if (!c_list_is_empty(&bzobj->process_change_lst)) {
        nm_strbuf_append_str(&buf, &len, prefix);
        prefix = ", ";
        nm_strbuf_append(&buf, &len, "change-pending-on-idle: 1");
    }

    if (_bzobjs_adapter_is_usable_for_device(bzobj)
        != bzobj->was_usable_adapter_for_device_before) {
        nm_strbuf_append_str(&buf, &len, prefix);
        prefix = ", ";
        nm_strbuf_append(&buf, &len, "change-usable-adapter-for-device: 1");
    }

    return buf0;
}

#define _LOG_bzobj(bzobj, context)                           \
    G_STMT_START                                             \
    {                                                        \
        const BzDBusObj *const _bzobj   = (bzobj);           \
        const char *const      _context = (context);         \
        char                   _buf[500];                    \
                                                             \
        _LOGT("change %-21s %s : { %s }",                    \
              _context,                                      \
              _bzobj->object_path,                           \
              _bzobj_to_string(_bzobj, _buf, sizeof(_buf))); \
    }                                                        \
    G_STMT_END

static gboolean
_bzobjs_is_dead(const BzDBusObj *bzobj)
{
    return !bzobj->d_has_adapter_iface && !bzobj->d_has_device_iface && !bzobj->d_has_network_iface
           && !bzobj->d_has_network_server_iface && c_list_is_empty(&bzobj->process_change_lst);
}

static BzDBusObj *
_bzobjs_get(NMBluezManager *self, const char *object_path)
{
    return g_hash_table_lookup(NM_BLUEZ_MANAGER_GET_PRIVATE(self)->bzobjs, &object_path);
}

static BzDBusObj *
_bzobjs_add(NMBluezManager *self, const char *object_path)
{
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    BzDBusObj             *bzobj;

    bzobj = _bz_dbus_obj_new(self, object_path);
    if (!g_hash_table_add(priv->bzobjs, bzobj))
        nm_assert_not_reached();
    return bzobj;
}

static void
_bzobjs_del(BzDBusObj *bzobj)
{
    nm_assert(bzobj);
    nm_assert(bzobj == _bzobjs_get(bzobj->self, bzobj->object_path));

    if (!g_hash_table_remove(NM_BLUEZ_MANAGER_GET_PRIVATE(bzobj->self)->bzobjs, bzobj))
        nm_assert_not_reached();
}

static void
_bzobjs_del_if_dead(BzDBusObj *bzobj)
{
    if (_bzobjs_is_dead(bzobj))
        _bzobjs_del(bzobj);
}

static BzDBusObj *
_bzobjs_init(NMBluezManager *self, BzDBusObj **inout, const char *object_path)
{
    nm_assert(NM_IS_BLUEZ_MANAGER(self));
    nm_assert(object_path);
    nm_assert(inout);

    if (!*inout) {
        *inout = _bzobjs_get(self, object_path);
        if (!*inout)
            *inout = _bzobjs_add(self, object_path);
    }

    nm_assert(nm_streq((*inout)->object_path, object_path));
    nm_assert(*inout == _bzobjs_get(self, object_path));
    return *inout;
}

static gboolean
_bzobjs_adapter_is_usable_for_device(const BzDBusObj *bzobj)
{
    return bzobj->d_has_adapter_iface && bzobj->d_adapter.address && bzobj->d_adapter_powered;
}

static gboolean
_bzobjs_device_is_usable(const BzDBusObj *bzobj,
                         BzDBusObj      **out_adapter_bzobj,
                         gboolean        *out_create_panu_connection)
{
    NMBluezManager        *self;
    NMBluezManagerPrivate *priv;
    gboolean               usable_dun = FALSE;
    gboolean               usable_nap = FALSE;
    BzDBusObj             *bzobj_adapter;
    gboolean               create_panu_connection = FALSE;

    if (!bzobj->d_has_device_iface
        || !NM_FLAGS_ANY((NMBluetoothCapabilities) bzobj->d_device_capabilities,
                         _NM_BT_CAPABILITY_SUPPORTED)
        || !bzobj->d_device.name || !bzobj->d_device.address || !bzobj->d_device_paired
        || !bzobj->d_device.adapter)
        goto out_unusable;

    self = bzobj->self;

    priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    if (!priv->settings_registered)
        goto out_unusable;

    bzobj_adapter = _bzobjs_get(self, bzobj->d_device.adapter);
    if (!bzobj_adapter || !_bzobjs_adapter_is_usable_for_device(bzobj_adapter))
        goto out_unusable;

#if WITH_BLUEZ5_DUN
    if (NM_FLAGS_HAS(bzobj->d_device_capabilities, NM_BT_CAPABILITY_DUN)) {
        if (_conn_track_find_head(self, NM_BT_CAPABILITY_DUN, bzobj->d_device.address))
            usable_dun = TRUE;
    }
#endif

    if (NM_FLAGS_HAS(bzobj->d_device_capabilities, NM_BT_CAPABILITY_NAP)) {
        if (!bzobj->d_has_network_iface)
            usable_nap = FALSE;
        else if (_conn_track_find_head(self, NM_BT_CAPABILITY_NAP, bzobj->d_device.address))
            usable_nap = TRUE;
        else if (bzobj->x_device_panu_connection_allow_create) {
            /* We didn't yet try to create a connection. Presume we are going to create
             * it when the time comes... */
            usable_nap             = TRUE;
            create_panu_connection = TRUE;
        }
    }

    if (!usable_dun && !usable_nap) {
        if (bzobj->x_device.device_bt
            && nm_device_get_state(NM_DEVICE(bzobj->x_device.device_bt))
                   > NM_DEVICE_STATE_DISCONNECTED) {
            /* The device is still activated... the absence of a profile does not
             * render it unusable (yet). But since there is no more profile, the
             * device is probably about to disconnect. */
        } else
            goto out_unusable;
    }

    NM_SET_OUT(out_create_panu_connection, create_panu_connection);
    NM_SET_OUT(out_adapter_bzobj, bzobj_adapter);
    return TRUE;

out_unusable:
    NM_SET_OUT(out_create_panu_connection, FALSE);
    NM_SET_OUT(out_adapter_bzobj, NULL);
    return FALSE;
}

static gboolean
_bzobjs_device_is_connected(const BzDBusObj *bzobj)
{
    nm_assert(_bzobjs_device_is_usable(bzobj, NULL, NULL));

    if (!bzobj->d_has_device_iface || !bzobj->d_device_connected)
        return FALSE;

    if (bzobj->d_has_network_iface && bzobj->d_network_connected)
        return TRUE;
    if (bzobj->x_device.connect_dun_context) {
        /* As long as we have a dun-context, we consider it connected.
         *
         * We require NMDeviceBt to try to connect to the modem, and if that fails,
         * it will disconnect. */
        return TRUE;
    }
    return FALSE;
}

static gboolean
_bzobjs_network_server_is_usable(const BzDBusObj *bzobj, gboolean require_powered)
{
    return bzobj->d_has_network_server_iface && bzobj->d_has_adapter_iface
           && bzobj->d_adapter.address && (!require_powered || bzobj->d_adapter_powered);
}

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

static ConnDataHead *
_conn_data_head_new(NMBluetoothCapabilities bt_type, const char *bdaddr)
{
    ConnDataHead *cdata_hd;
    gsize         l;

    nm_assert(NM_IN_SET(bt_type, NM_BT_CAPABILITY_DUN, NM_BT_CAPABILITY_NAP));
    nm_assert(bdaddr);

    l         = strlen(bdaddr) + 1;
    cdata_hd  = g_malloc(sizeof(ConnDataHead) + l);
    *cdata_hd = (ConnDataHead){
        .bdaddr   = cdata_hd->bdaddr_data,
        .lst_head = C_LIST_INIT(cdata_hd->lst_head),
        .bt_type  = bt_type,
    };
    memcpy(cdata_hd->bdaddr_data, bdaddr, l);

    nm_assert(cdata_hd->bt_type == bt_type);

    return cdata_hd;
}

static guint
_conn_data_head_hash(gconstpointer ptr)
{
    const ConnDataHead *cdata_hd = ptr;
    NMHashState         h;

    nm_hash_init(&h, 520317467u);
    nm_hash_update_val(&h, (NMBluetoothCapabilities) cdata_hd->bt_type);
    nm_hash_update_str(&h, cdata_hd->bdaddr);
    return nm_hash_complete(&h);
}

static gboolean
_conn_data_head_equal(gconstpointer a, gconstpointer b)
{
    const ConnDataHead *cdata_hd_a = a;
    const ConnDataHead *cdata_hd_b = b;

    return cdata_hd_a->bt_type == cdata_hd_b->bt_type
           && nm_streq(cdata_hd_a->bdaddr, cdata_hd_b->bdaddr);
}

static ConnDataHead *
_conn_track_find_head(NMBluezManager *self, NMBluetoothCapabilities bt_type, const char *bdaddr)
{
    ConnDataHead cdata_hd = {
        .bt_type = bt_type,
        .bdaddr  = bdaddr,
    };

    return g_hash_table_lookup(NM_BLUEZ_MANAGER_GET_PRIVATE(self)->conn_data_heads, &cdata_hd);
}

static ConnDataElem *
_conn_track_find_elem(NMBluezManager *self, NMSettingsConnection *sett_conn)
{
    G_STATIC_ASSERT(G_STRUCT_OFFSET(ConnDataElem, sett_conn) == 0);

    return g_hash_table_lookup(NM_BLUEZ_MANAGER_GET_PRIVATE(self)->conn_data_elems, &sett_conn);
}

static gboolean
_conn_track_is_relevant_connection(NMConnection            *connection,
                                   NMBluetoothCapabilities *out_bt_type,
                                   const char             **out_bdaddr)
{
    NMSettingBluetooth     *s_bt;
    NMBluetoothCapabilities bt_type;
    const char             *bdaddr;
    const char             *b_type;

    s_bt = nm_connection_get_setting_bluetooth(connection);
    if (!s_bt)
        return FALSE;

    if (!nm_connection_is_type(connection, NM_SETTING_BLUETOOTH_SETTING_NAME))
        return FALSE;

    bdaddr = nm_setting_bluetooth_get_bdaddr(s_bt);
    if (!bdaddr)
        return FALSE;

    b_type = nm_setting_bluetooth_get_connection_type(s_bt);

    if (nm_streq(b_type, NM_SETTING_BLUETOOTH_TYPE_DUN))
        bt_type = NM_BT_CAPABILITY_DUN;
    else if (nm_streq(b_type, NM_SETTING_BLUETOOTH_TYPE_PANU))
        bt_type = NM_BT_CAPABILITY_NAP;
    else
        return FALSE;

    NM_SET_OUT(out_bt_type, bt_type);
    NM_SET_OUT(out_bdaddr, bdaddr);
    return TRUE;
}

static gboolean
_conn_track_is_relevant_sett_conn(NMSettingsConnection    *sett_conn,
                                  NMBluetoothCapabilities *out_bt_type,
                                  const char             **out_bdaddr)
{
    NMConnection *connection;

    connection = nm_settings_connection_get_connection(sett_conn);
    if (!connection)
        return FALSE;

    return _conn_track_is_relevant_connection(connection, out_bt_type, out_bdaddr);
}

static gboolean
_conn_track_is_relevant_for_sett_conn(NMSettingsConnection   *sett_conn,
                                      NMBluetoothCapabilities bt_type,
                                      const char             *bdaddr)
{
    NMBluetoothCapabilities x_bt_type;
    const char             *x_bdaddr;

    return bdaddr && _conn_track_is_relevant_sett_conn(sett_conn, &x_bt_type, &x_bdaddr)
           && x_bt_type == bt_type && nm_streq(x_bdaddr, bdaddr);
}

static void
_conn_track_schedule_notify(NMBluezManager         *self,
                            NMBluetoothCapabilities bt_type,
                            const char             *bdaddr)
{
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    GHashTableIter         iter;
    BzDBusObj             *bzobj;

    g_hash_table_iter_init(&iter, priv->bzobjs);
    while (g_hash_table_iter_next(&iter, (gpointer *) &bzobj, NULL)) {
        gboolean device_is_usable;

        device_is_usable = _bzobjs_device_is_usable(bzobj, NULL, NULL);
        if (bzobj->x_device_is_usable != device_is_usable)
            _process_change_idle_schedule(self, bzobj);
    }
}

static void
_conn_track_update(NMBluezManager       *self,
                   NMSettingsConnection *sett_conn,
                   gboolean              track,
                   gboolean             *out_changed,
                   gboolean             *out_changed_usable,
                   ConnDataElem        **out_conn_data_elem)
{
    NMBluezManagerPrivate  *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    ConnDataHead           *cdata_hd;
    ConnDataElem           *cdata_el;
    ConnDataElem           *cdata_el_remove = NULL;
    NMBluetoothCapabilities bt_type;
    const char             *bdaddr;
    gboolean                changed        = FALSE;
    gboolean                changed_usable = FALSE;
    char                    sbuf_cap[100];

    nm_assert(NM_IS_SETTINGS_CONNECTION(sett_conn));

    cdata_el = _conn_track_find_elem(self, sett_conn);

    if (track)
        track = _conn_track_is_relevant_sett_conn(sett_conn, &bt_type, &bdaddr);

    if (!track) {
        cdata_el_remove = g_steal_pointer(&cdata_el);
        goto out_remove;
    }

    if (cdata_el) {
        cdata_hd = cdata_el->cdata_hd;
        if (cdata_hd->bt_type != bt_type || !nm_streq(cdata_hd->bdaddr, bdaddr))
            cdata_el_remove = g_steal_pointer(&cdata_el);
    }

    if (!cdata_el) {
        _LOGT("connection: track for %s, %s: %s (%s)",
              nm_bluetooth_capability_to_string(bt_type, sbuf_cap, sizeof(sbuf_cap)),
              bdaddr,
              nm_settings_connection_get_uuid(sett_conn),
              nm_settings_connection_get_id(sett_conn));
        changed  = TRUE;
        cdata_hd = _conn_track_find_head(self, bt_type, bdaddr);
        if (!cdata_hd) {
            changed_usable = TRUE;
            cdata_hd       = _conn_data_head_new(bt_type, bdaddr);
            if (!g_hash_table_add(priv->conn_data_heads, cdata_hd))
                nm_assert_not_reached();
            _conn_track_schedule_notify(self, bt_type, bdaddr);
        }
        cdata_el            = g_slice_new(ConnDataElem);
        cdata_el->sett_conn = sett_conn;
        cdata_el->cdata_hd  = cdata_hd;
        c_list_link_tail(&cdata_hd->lst_head, &cdata_el->lst);
        if (!g_hash_table_add(priv->conn_data_elems, cdata_el))
            nm_assert_not_reached();
    }

out_remove:
    if (cdata_el_remove) {
        GHashTableIter iter;
        BzDBusObj     *bzobj;

        _LOGT("connection: untrack for %s, %s: %s (%s)",
              nm_bluetooth_capability_to_string(cdata_el_remove->cdata_hd->bt_type,
                                                sbuf_cap,
                                                sizeof(sbuf_cap)),
              cdata_el_remove->cdata_hd->bdaddr,
              nm_settings_connection_get_uuid(sett_conn),
              nm_settings_connection_get_id(sett_conn));

        g_hash_table_iter_init(&iter, priv->bzobjs);
        while (g_hash_table_iter_next(&iter, (gpointer *) &bzobj, NULL)) {
            if (bzobj->x_device.panu_connection == sett_conn)
                bzobj->x_device.panu_connection = NULL;
        }

        changed  = TRUE;
        cdata_hd = cdata_el_remove->cdata_hd;
        c_list_unlink_stale(&cdata_el_remove->lst);
        if (!g_hash_table_remove(priv->conn_data_elems, cdata_el_remove))
            nm_assert_not_reached();
        if (c_list_is_empty(&cdata_hd->lst_head)) {
            changed_usable = TRUE;
            _conn_track_schedule_notify(self, cdata_hd->bt_type, cdata_hd->bdaddr);
            if (!g_hash_table_remove(priv->conn_data_heads, cdata_hd))
                nm_assert_not_reached();
        }
    }

    NM_SET_OUT(out_changed, changed);
    NM_SET_OUT(out_changed_usable, changed_usable);
    NM_SET_OUT(out_conn_data_elem, cdata_el);
}

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

static void
cp_connection_added(NMSettings *settings, NMSettingsConnection *sett_conn, NMBluezManager *self)
{
    _conn_track_update(self, sett_conn, TRUE, NULL, NULL, NULL);
}

static void
cp_connection_updated(NMSettings           *settings,
                      NMSettingsConnection *sett_conn,
                      guint                 update_reason_u,
                      NMBluezManager       *self)
{
    _conn_track_update(self, sett_conn, TRUE, NULL, NULL, NULL);
}

static void
cp_connection_removed(NMSettings *settings, NMSettingsConnection *sett_conn, NMBluezManager *self)
{
    _conn_track_update(self, sett_conn, FALSE, NULL, NULL, NULL);
}

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

static NMBluezManager *
_network_server_get_bluez_manager(const NMBtVTableNetworkServer *vtable_network_server)
{
    NMBluezManager *self;

    self = (NMBluezManager *) (((char *) vtable_network_server)
                               - G_STRUCT_OFFSET(NMBluezManager, _priv.vtable_network_server));

    g_return_val_if_fail(NM_IS_BLUEZ_MANAGER(self), NULL);

    return self;
}

static BzDBusObj *
_network_server_find_has_device(NMBluezManagerPrivate *priv, NMDevice *device)
{
    BzDBusObj *bzobj;

    c_list_for_each_entry (bzobj, &priv->network_server_lst_head, x_network_server.lst) {
        if (bzobj->x_network_server.device_br == device)
            return bzobj;
    }
    return NULL;
}

static BzDBusObj *
_network_server_find_available(NMBluezManagerPrivate *priv,
                               const char            *addr,
                               NMDevice              *device_accept_busy)
{
    BzDBusObj *bzobj;

    c_list_for_each_entry (bzobj, &priv->network_server_lst_head, x_network_server.lst) {
        if (bzobj->x_network_server.device_br) {
            if (bzobj->x_network_server.device_br != device_accept_busy)
                continue;
        }
        if (addr && !nm_streq(addr, bzobj->d_adapter.address))
            continue;
        nm_assert(!bzobj->x_network_server.r_req_data);
        return bzobj;
    }
    return NULL;
}

static gboolean
_network_server_vt_is_available(const NMBtVTableNetworkServer *vtable,
                                const char                    *addr,
                                NMDevice                      *device_accept_busy)
{
    NMBluezManager        *self = _network_server_get_bluez_manager(vtable);
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    return !!_network_server_find_available(priv, addr, device_accept_busy);
}

static void
_network_server_register_cb(GObject *source_object, GAsyncResult *res, gpointer user_data)
{
    gs_unref_variant GVariant *ret   = NULL;
    gs_free_error GError      *error = NULL;
    BzDBusObj                 *bzobj;

    ret = g_dbus_connection_call_finish(G_DBUS_CONNECTION(source_object), res, &error);
    if (!ret && nm_utils_error_is_cancelled(error))
        return;

    bzobj = user_data;

    if (!ret) {
        _LOGT("NAP: [%s]: registering failed: %s", bzobj->object_path, error->message);
    } else
        _LOGT("NAP: [%s]: registration successful", bzobj->object_path);

    g_clear_object(&bzobj->x_network_server.r_req_data->int_cancellable);
    _network_server_register_req_data_complete(g_steal_pointer(&bzobj->x_network_server.r_req_data),
                                               error);
}

static void
_network_server_register_cancelled_cb(GCancellable *cancellable, BzDBusObj *bzobj)
{
    _network_server_unregister_bridge(bzobj->self, bzobj, "registration cancelled");
}

static gboolean
_network_server_vt_register_bridge(const NMBtVTableNetworkServer *vtable,
                                   const char                    *addr,
                                   NMDevice                      *device,
                                   GCancellable                  *cancellable,
                                   NMBtVTableRegisterCallback     callback,
                                   gpointer                       callback_user_data,
                                   GError                       **error)
{
    NMBluezManager               *self = _network_server_get_bluez_manager(vtable);
    NMBluezManagerPrivate        *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    NetworkServerRegisterReqData *r_req_data;
    BzDBusObj                    *bzobj;
    const char                   *ifname;

    g_return_val_if_fail(NM_IS_DEVICE(device), FALSE);
    g_return_val_if_fail(G_IS_CANCELLABLE(cancellable), FALSE);

    nm_assert(!g_cancellable_is_cancelled(cancellable));
    nm_assert(!_network_server_find_has_device(priv, device));

    ifname = nm_device_get_iface(device);
    g_return_val_if_fail(ifname, FALSE);

    g_return_val_if_fail(ifname, FALSE);

    bzobj = _network_server_find_available(priv, addr, NULL);
    if (!bzobj) {
        /* The device checked that a network server is available, before
         * starting the activation, but for some reason it no longer is.
         * Indicate that the activation should not proceed. */
        if (addr) {
            nm_utils_error_set(error,
                               NM_UTILS_ERROR_UNKNOWN,
                               "adapter %s is not available for %s",
                               addr,
                               ifname);
        } else {
            nm_utils_error_set(error,
                               NM_UTILS_ERROR_UNKNOWN,
                               "no adapter available for %s",
                               ifname);
        }
        return FALSE;
    }

    _LOGD("NAP: [%s]: registering \"%s\" on adapter %s",
          bzobj->object_path,
          ifname,
          bzobj->d_adapter.address);

    r_req_data  = g_slice_new(NetworkServerRegisterReqData);
    *r_req_data = (NetworkServerRegisterReqData){
        .int_cancellable    = g_cancellable_new(),
        .ext_cancellable    = g_object_ref(cancellable),
        .callback           = callback,
        .callback_user_data = callback_user_data,
        .ext_cancelled_id   = g_signal_connect(cancellable,
                                             "cancelled",
                                             G_CALLBACK(_network_server_register_cancelled_cb),
                                             bzobj),
    };

    bzobj->x_network_server.device_br  = g_object_ref(device);
    bzobj->x_network_server.r_req_data = r_req_data;

    g_dbus_connection_call(priv->dbus_connection,
                           priv->name_owner,
                           bzobj->object_path,
                           NM_BLUEZ5_NETWORK_SERVER_INTERFACE,
                           "Register",
                           g_variant_new("(ss)", BLUETOOTH_CONNECT_NAP, ifname),
                           NULL,
                           G_DBUS_CALL_FLAGS_NO_AUTO_START,
                           -1,
                           bzobj->x_network_server.r_req_data->int_cancellable,
                           _network_server_register_cb,
                           bzobj);
    return TRUE;
}

static void
_network_server_unregister_bridge_complete_on_idle_cb(gpointer user_data, GCancellable *cancellable)
{
    gs_free_error GError         *error  = NULL;
    gs_free char                 *reason = NULL;
    NetworkServerRegisterReqData *r_req_data;

    nm_utils_user_data_unpack(user_data, &r_req_data, &reason);

    nm_utils_error_set(&error,
                       NM_UTILS_ERROR_UNKNOWN,
                       "registration was aborted due to %s",
                       reason);
    _network_server_register_req_data_complete(r_req_data, error);
}

static void
_network_server_unregister_bridge(NMBluezManager *self, BzDBusObj *bzobj, const char *reason)
{
    NMBluezManagerPrivate               *priv   = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    _nm_unused gs_unref_object NMDevice *device = NULL;
    NetworkServerRegisterReqData        *r_req_data;

    nm_assert(NM_IS_DEVICE(bzobj->x_network_server.device_br));

    _LOGD("NAP: [%s]: unregistering \"%s\" (%s)",
          bzobj->object_path,
          nm_device_get_iface(bzobj->x_network_server.device_br),
          reason);

    device = g_steal_pointer(&bzobj->x_network_server.device_br);

    r_req_data = g_steal_pointer(&bzobj->x_network_server.r_req_data);

    if (priv->name_owner) {
        gs_unref_object GCancellable *cancellable = NULL;

        cancellable = g_cancellable_new();

        nm_shutdown_wait_obj_register_cancellable_full(
            cancellable,
            g_strdup_printf("bt-unregister-nap[%s]", bzobj->object_path),
            TRUE);

        g_dbus_connection_call(priv->dbus_connection,
                               priv->name_owner,
                               bzobj->object_path,
                               NM_BLUEZ5_NETWORK_SERVER_INTERFACE,
                               "Unregister",
                               g_variant_new("(s)", BLUETOOTH_CONNECT_NAP),
                               NULL,
                               G_DBUS_CALL_FLAGS_NO_AUTO_START,
                               -1,
                               cancellable,
                               _dbus_call_complete_cb_nop,
                               NULL);
    }

    if (r_req_data) {
        nm_clear_g_cancellable(&r_req_data->int_cancellable);
        nm_utils_invoke_on_idle(r_req_data->ext_cancellable,
                                _network_server_unregister_bridge_complete_on_idle_cb,
                                nm_utils_user_data_pack(r_req_data, g_strdup(reason)));
    }

    _nm_device_bridge_notify_unregister_bt_nap(device, reason);
}

static gboolean
_network_server_vt_unregister_bridge(const NMBtVTableNetworkServer *vtable, NMDevice *device)
{
    NMBluezManager        *self = _network_server_get_bluez_manager(vtable);
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    BzDBusObj             *bzobj;

    g_return_val_if_fail(NM_IS_DEVICE(device), FALSE);

    bzobj = _network_server_find_has_device(priv, device);
    if (bzobj)
        _network_server_unregister_bridge(self, bzobj, "disconnecting");

    return TRUE;
}

static void
_network_server_process_change(BzDBusObj *bzobj, gboolean *out_emit_device_availability_changed)
{
    NMBluezManager        *self = bzobj->self;
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    gboolean               network_server_is_usable;
    gboolean               emit_device_availability_changed = FALSE;

    network_server_is_usable = _bzobjs_network_server_is_usable(bzobj, TRUE);

    if (!network_server_is_usable) {
        if (!c_list_is_empty(&bzobj->x_network_server.lst)) {
            emit_device_availability_changed = TRUE;
            c_list_unlink(&bzobj->x_network_server.lst);
        }

        nm_clear_g_free(&bzobj->x_network_server.adapter_address);

        if (bzobj->x_network_server.device_br) {
            _network_server_unregister_bridge(self,
                                              bzobj,
                                              _bzobjs_network_server_is_usable(bzobj, FALSE)
                                                  ? "adapter disabled"
                                                  : "adapter disappeared");
        }

    } else {
        if (!nm_streq0(bzobj->x_network_server.adapter_address, bzobj->d_adapter.address)) {
            emit_device_availability_changed = TRUE;
            g_free(bzobj->x_network_server.adapter_address);
            bzobj->x_network_server.adapter_address = g_strdup(bzobj->d_adapter.address);
        }

        if (c_list_is_empty(&bzobj->x_network_server.lst)) {
            emit_device_availability_changed = TRUE;
            c_list_link_tail(&priv->network_server_lst_head, &bzobj->x_network_server.lst);
        }
    }

    if (emit_device_availability_changed)
        NM_SET_OUT(out_emit_device_availability_changed, TRUE);
}

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

static void
_conn_create_panu_connection(NMBluezManager *self, BzDBusObj *bzobj)
{
    NMBluezManagerPrivate        *priv       = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    gs_unref_object NMConnection *connection = NULL;
    NMSettingsConnection         *added;
    NMSetting                    *setting;
    gs_free char                 *id = NULL;
    char                          uuid[37];
    gs_free_error GError         *error = NULL;

    nm_uuid_generate_random_str_arr(uuid);
    id = g_strdup_printf(_("%s Network"), bzobj->d_device.name);

    connection = nm_simple_connection_new();

    setting = nm_setting_connection_new();
    g_object_set(setting,
                 NM_SETTING_CONNECTION_ID,
                 id,
                 NM_SETTING_CONNECTION_UUID,
                 uuid,
                 NM_SETTING_CONNECTION_AUTOCONNECT,
                 FALSE,
                 NM_SETTING_CONNECTION_TYPE,
                 NM_SETTING_BLUETOOTH_SETTING_NAME,
                 NULL);
    nm_connection_add_setting(connection, setting);

    setting = nm_setting_bluetooth_new();
    g_object_set(setting,
                 NM_SETTING_BLUETOOTH_BDADDR,
                 bzobj->d_device.address,
                 NM_SETTING_BLUETOOTH_TYPE,
                 NM_SETTING_BLUETOOTH_TYPE_PANU,
                 NULL);
    nm_connection_add_setting(connection, setting);

    if (!nm_connection_normalize(connection, NULL, NULL, &error)) {
        _LOGE("connection: couldn't generate a connection for NAP device: %s", error->message);
        g_return_if_reached();
    }

    nm_assert(_conn_track_is_relevant_connection(connection, NULL, NULL));

    _LOGT("connection: create in-memory PANU connection %s (%s) for device \"%s\" (%s)",
          uuid,
          id,
          bzobj->d_device.name,
          bzobj->d_device.address);

    nm_settings_add_connection(priv->settings,
                               connection,
                               NM_SETTINGS_CONNECTION_PERSIST_MODE_IN_MEMORY_ONLY,
                               NM_SETTINGS_CONNECTION_ADD_REASON_NONE,
                               NM_SETTINGS_CONNECTION_INT_FLAGS_NM_GENERATED,
                               &added,
                               &error);
    if (!added) {
        _LOGW("connection: couldn't add new Bluetooth connection for NAP device: '%s' (%s): %s",
              id,
              uuid,
              error->message);
        return;
    }

    if (!_conn_track_is_relevant_for_sett_conn(added, NM_BT_CAPABILITY_NAP, bzobj->d_device.address)
        || !_conn_track_find_elem(self, added) || bzobj->x_device.panu_connection) {
        _LOGE("connection: something went wrong creating PANU connection %s (%s) for device '%s'",
              uuid,
              id,
              bzobj->d_device.address);
        g_return_if_reached();
    }

    bzobj->x_device.panu_connection = added;
}

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

static void
_device_state_changed_cb(NMDevice *device,
                         guint     new_state_u,
                         guint     old_state_u,
                         guint     reason_u,
                         gpointer  user_data)
{
    BzDBusObj *bzobj = user_data;

    if (!_bzobjs_device_is_usable(bzobj, NULL, NULL)) {
        /* the device got unusable? Need to revisit it... */
        _process_change_idle_schedule(bzobj->self, bzobj);
    }
}

static void
_device_process_change(BzDBusObj *bzobj)
{
    NMBluezManager             *self           = bzobj->self;
    gs_unref_object NMDeviceBt *device_added   = NULL;
    gs_unref_object NMDeviceBt *device_deleted = NULL;
    gboolean                    device_is_usable;
    gboolean                    create_panu_connection = FALSE;

    device_is_usable = _bzobjs_device_is_usable(bzobj, NULL, &create_panu_connection);

    if (create_panu_connection) {
        bzobj->x_device_panu_connection_allow_create = FALSE;
        _conn_create_panu_connection(self, bzobj);
        device_is_usable = _bzobjs_device_is_usable(bzobj, NULL, NULL);
    } else {
        if (device_is_usable && bzobj->x_device_panu_connection_allow_create
            && NM_FLAGS_HAS(bzobj->d_device_capabilities, NM_BT_CAPABILITY_NAP)
            && _conn_track_find_head(self, NM_BT_CAPABILITY_NAP, bzobj->d_device.address)) {
            /* We have a useable device and also a panu-connection. We block future attemps
             * to generate a connection. */
            bzobj->x_device_panu_connection_allow_create = FALSE;
        }
        if (bzobj->x_device.panu_connection) {
            if (!NM_FLAGS_HAS(nm_settings_connection_get_flags(bzobj->x_device.panu_connection),
                              NM_SETTINGS_CONNECTION_INT_FLAGS_NM_GENERATED)) {
                /* the connection that we generated earlier still exists, but it's not longer the same
                 * as it was when we created it. Forget about it, so that we don't delete the profile later... */
                bzobj->x_device.panu_connection = NULL;
            } else {
                if (!device_is_usable
                    || !_conn_track_is_relevant_for_sett_conn(bzobj->x_device.panu_connection,
                                                              NM_BT_CAPABILITY_NAP,
                                                              bzobj->d_device.address)) {
                    _LOGT("connection: delete in-memory PANU connection %s (%s) as device %s",
                          nm_settings_connection_get_uuid(bzobj->x_device.panu_connection),
                          nm_settings_connection_get_id(bzobj->x_device.panu_connection),
                          !device_is_usable ? "is now unusable" : "no longer matches");
                    bzobj->x_device_panu_connection_allow_create = TRUE;
                    nm_settings_connection_delete(g_steal_pointer(&bzobj->x_device.panu_connection),
                                                  FALSE);
                }
            }
        }
    }

    bzobj->x_device_is_connected = device_is_usable && _bzobjs_device_is_connected(bzobj);

    bzobj->x_device_is_usable = device_is_usable;

    if (bzobj->x_device.device_bt) {
        const char *device_to_delete_msg;

        if (!device_is_usable)
            device_to_delete_msg = "device became unusable";
        else if (!_nm_device_bt_for_same_device(bzobj->x_device.device_bt,
                                                bzobj->object_path,
                                                bzobj->d_device.address,
                                                NULL,
                                                bzobj->d_device_capabilities))
            device_to_delete_msg = "device is no longer compatible";
        else
            device_to_delete_msg = NULL;

        if (device_to_delete_msg) {
            nm_clear_g_signal_handler(bzobj->x_device.device_bt,
                                      &bzobj->x_device.device_bt_signal_id);

            device_deleted = g_steal_pointer(&bzobj->x_device.device_bt);

            _LOGD("[%s]: drop device because %s", bzobj->object_path, device_to_delete_msg);

            _connect_disconnect(self, bzobj, device_to_delete_msg);
        }
    }

    if (device_is_usable) {
        if (!bzobj->x_device.device_bt) {
            bzobj->x_device.device_bt = nm_device_bt_new(self,
                                                         bzobj->object_path,
                                                         bzobj->d_device.address,
                                                         bzobj->d_device.name,
                                                         bzobj->d_device_capabilities);
            device_added              = g_object_ref(bzobj->x_device.device_bt);
            bzobj->x_device.device_bt_signal_id =
                g_signal_connect(device_added,
                                 NM_DEVICE_STATE_CHANGED,
                                 G_CALLBACK(_device_state_changed_cb),
                                 bzobj);
        } else
            _nm_device_bt_notify_set_name(bzobj->x_device.device_bt, bzobj->d_device.name);

        _nm_device_bt_notify_set_connected(bzobj->x_device.device_bt, bzobj->x_device_is_connected);
    }

    if (bzobj->x_device.c_req_data && !bzobj->x_device.c_req_data->int_cancellable
        && bzobj->x_device_is_connected) {
        gs_free char *device_name = g_steal_pointer(&bzobj->x_device.c_req_data->device_name);

        _device_connect_req_data_complete(g_steal_pointer(&bzobj->x_device.c_req_data),
                                          self,
                                          device_name,
                                          NULL);
    }

    if (device_added)
        g_signal_emit_by_name(self, NM_DEVICE_FACTORY_DEVICE_ADDED, device_added);

    if (device_deleted)
        _nm_device_bt_notify_removed(device_deleted);
}

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

static void
_process_change_idle_all(NMBluezManager *self, gboolean *out_emit_device_availability_changed)
{
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    BzDBusObj             *bzobj;

    while (
        (bzobj =
             c_list_first_entry(&priv->process_change_lst_head, BzDBusObj, process_change_lst))) {
        c_list_unlink(&bzobj->process_change_lst);

        _LOG_bzobj(bzobj, "before-processing");

        _device_process_change(bzobj);

        _network_server_process_change(bzobj, out_emit_device_availability_changed);

        _LOG_bzobj(bzobj, "after-processing");

        _bzobjs_del_if_dead(bzobj);
    }

    nm_clear_g_source(&priv->process_change_idle_id);
}

static gboolean
_process_change_idle_cb(gpointer user_data)
{
    NMBluezManager        *self                             = user_data;
    NMBluezManagerPrivate *priv                             = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    gboolean               emit_device_availability_changed = FALSE;

    _process_change_idle_all(self, &emit_device_availability_changed);

    if (emit_device_availability_changed)
        nm_manager_notify_device_availability_maybe_changed(priv->manager);

    return G_SOURCE_CONTINUE;
}

static void
_process_change_idle_schedule(NMBluezManager *self, BzDBusObj *bzobj)
{
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    nm_c_list_move_tail(&priv->process_change_lst_head, &bzobj->process_change_lst);
    if (priv->process_change_idle_id == 0)
        priv->process_change_idle_id =
            g_idle_add_full(G_PRIORITY_DEFAULT_IDLE + 1, _process_change_idle_cb, self, NULL);
}

static void
_dbus_process_changes(NMBluezManager *self, BzDBusObj *bzobj, const char *log_reason)
{
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    gboolean               network_server_is_usable;
    gboolean               adapter_is_usable_for_device;
    gboolean               device_is_usable;
    gboolean               changes                     = FALSE;
    gboolean               recheck_devices_for_adapter = FALSE;

    nm_assert(bzobj);

    _LOG_bzobj(bzobj, log_reason);

    device_is_usable = _bzobjs_device_is_usable(bzobj, NULL, NULL);

    if (bzobj->x_device_is_usable != device_is_usable)
        changes = TRUE;
    else if (bzobj->x_device.device_bt) {
        if (!device_is_usable)
            changes = TRUE;
        else {
            if (bzobj->x_device_is_connected != _bzobjs_device_is_connected(bzobj)
                || !_nm_device_bt_for_same_device(bzobj->x_device.device_bt,
                                                  bzobj->object_path,
                                                  bzobj->d_device.address,
                                                  bzobj->d_device.name,
                                                  bzobj->d_device_capabilities))
                changes = TRUE;
        }
    }

    adapter_is_usable_for_device = _bzobjs_adapter_is_usable_for_device(bzobj);
    if (adapter_is_usable_for_device != bzobj->was_usable_adapter_for_device_before) {
        /* this function does not modify bzobj in any other cases except here.
         * Usually changes are processed delayed, in the idle handler.
         *
         * But the bzobj->was_usable_adapter_for_device_before only exists to know whether
         * we need to re-check device availability. It is correct to set the flag
         * here, right before we checked. */
        bzobj->was_usable_adapter_for_device_before = adapter_is_usable_for_device;
        recheck_devices_for_adapter                 = TRUE;
        changes                                     = TRUE;
    }

    if (!changes) {
        network_server_is_usable = _bzobjs_network_server_is_usable(bzobj, TRUE);

        if (network_server_is_usable != (!c_list_is_empty(&bzobj->x_network_server.lst)))
            changes = TRUE;
        else if (bzobj->x_network_server.device_br && !network_server_is_usable)
            changes = TRUE;
        else if (!nm_streq0(bzobj->d_has_adapter_iface ? bzobj->d_adapter.address : NULL,
                            bzobj->x_network_server.adapter_address))
            changes = TRUE;
    }

    if (changes)
        _process_change_idle_schedule(self, bzobj);

    if (recheck_devices_for_adapter) {
        GHashTableIter iter;
        BzDBusObj     *bzobj2;

        /* we got a change to the availability of an adapter. We might need to recheck
         * all devices that use this adapter... */
        g_hash_table_iter_init(&iter, priv->bzobjs);
        while (g_hash_table_iter_next(&iter, (gpointer *) &bzobj2, NULL)) {
            if (bzobj2 == bzobj)
                continue;
            if (!nm_streq0(bzobj2->d_device.adapter, bzobj->object_path))
                continue;
            if (c_list_is_empty(&bzobj2->process_change_lst))
                _dbus_process_changes(self, bzobj2, "adapter-changed");
            else
                nm_c_list_move_tail(&priv->process_change_lst_head, &bzobj2->process_change_lst);
        }
    }

    _bzobjs_del_if_dead(bzobj);
}

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

#define ALL_RELEVANT_INTERFACE_NAMES          \
    NM_MAKE_STRV(NM_BLUEZ5_ADAPTER_INTERFACE, \
                 NM_BLUEZ5_DEVICE_INTERFACE,  \
                 NM_BLUEZ5_NETWORK_INTERFACE, \
                 NM_BLUEZ5_NETWORK_SERVER_INTERFACE)

static gboolean
_dbus_handle_properties_changed(NMBluezManager    *self,
                                const char        *object_path,
                                const char        *interface_name,
                                GVariant          *changed_properties,
                                const char *const *invalidated_properties,
                                BzDBusObj        **inout_bzobj)
{
    BzDBusObj   *bzobj   = NULL;
    gboolean     changed = FALSE;
    const char  *property_name;
    GVariant    *property_value;
    GVariantIter iter_prop;
    gsize        i;

    if (!invalidated_properties)
        invalidated_properties = NM_PTRARRAY_EMPTY(const char *);

    nm_assert(g_variant_is_of_type(changed_properties, G_VARIANT_TYPE("a{sv}")));

    if (inout_bzobj) {
        bzobj = *inout_bzobj;
        nm_assert(!bzobj || nm_streq(object_path, bzobj->object_path));
    }

    if (changed_properties)
        g_variant_iter_init(&iter_prop, changed_properties);

    if (nm_streq(interface_name, NM_BLUEZ5_ADAPTER_INTERFACE)) {
        _bzobjs_init(self, &bzobj, object_path);
        if (!bzobj->d_has_adapter_iface) {
            changed                    = TRUE;
            bzobj->d_has_adapter_iface = TRUE;
        }

        while (changed_properties
               && g_variant_iter_next(&iter_prop, "{&sv}", &property_name, &property_value)) {
            _nm_unused gs_unref_variant GVariant *property_value_free = property_value;

            if (nm_streq(property_name, "Address")) {
                gs_free char *s =
                    g_variant_is_of_type(property_value, G_VARIANT_TYPE_STRING)
                        ? nm_utils_hwaddr_canonical(g_variant_get_string(property_value, NULL),
                                                    ETH_ALEN)
                        : NULL;

                if (!nm_streq0(bzobj->d_adapter.address, s)) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_adapter.address);
                    bzobj->d_adapter.address = g_steal_pointer(&s);
                }
                continue;
            }
            if (nm_streq(property_name, "Powered")) {
                bool v = g_variant_is_of_type(property_value, G_VARIANT_TYPE_BOOLEAN)
                         && g_variant_get_boolean(property_value);

                if (bzobj->d_adapter_powered != v) {
                    changed                  = TRUE;
                    bzobj->d_adapter_powered = v;
                }
                continue;
            }
        }

        for (i = 0; (property_name = invalidated_properties[i]); i++) {
            if (nm_streq(property_name, "Address")) {
                if (bzobj->d_adapter.address) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_adapter.address);
                }
                continue;
            }
            if (nm_streq(property_name, "Powered")) {
                if (bzobj->d_adapter_powered) {
                    changed                  = TRUE;
                    bzobj->d_adapter_powered = FALSE;
                }
                continue;
            }
        }

    } else if (nm_streq(interface_name, NM_BLUEZ5_DEVICE_INTERFACE)) {
        _bzobjs_init(self, &bzobj, object_path);
        if (!bzobj->d_has_device_iface) {
            changed                   = TRUE;
            bzobj->d_has_device_iface = TRUE;
        }

        while (changed_properties
               && g_variant_iter_next(&iter_prop, "{&sv}", &property_name, &property_value)) {
            _nm_unused gs_unref_variant GVariant *property_value_free = property_value;

            if (nm_streq(property_name, "Address")) {
                gs_free char *s =
                    g_variant_is_of_type(property_value, G_VARIANT_TYPE_STRING)
                        ? nm_utils_hwaddr_canonical(g_variant_get_string(property_value, NULL),
                                                    ETH_ALEN)
                        : NULL;

                if (!nm_streq0(bzobj->d_device.address, s)) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_device.address);
                    bzobj->d_device.address = g_steal_pointer(&s);
                }
                continue;
            }
            if (nm_streq(property_name, "Name")) {
                const char *s = g_variant_is_of_type(property_value, G_VARIANT_TYPE_STRING)
                                    ? g_variant_get_string(property_value, NULL)
                                    : NULL;

                if (!nm_streq0(bzobj->d_device.name, s)) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_device.name);
                    bzobj->d_device.name = g_strdup(s);
                }
                continue;
            }
            if (nm_streq(property_name, "Adapter")) {
                const char *s = g_variant_is_of_type(property_value, G_VARIANT_TYPE_OBJECT_PATH)
                                    ? g_variant_get_string(property_value, NULL)
                                    : NULL;

                if (!nm_streq0(bzobj->d_device.adapter, s)) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_device.adapter);
                    bzobj->d_device.adapter = g_strdup(s);
                }
                continue;
            }
            if (nm_streq(property_name, "UUIDs")) {
                NMBluetoothCapabilities capabilities = NM_BT_CAPABILITY_NONE;

                if (g_variant_is_of_type(property_value, G_VARIANT_TYPE_STRING_ARRAY)) {
                    gs_free const char **s = g_variant_get_strv(property_value, NULL);

                    capabilities = convert_uuids_to_capabilities(s);
                }
                if (bzobj->d_device_capabilities != capabilities) {
                    changed                      = TRUE;
                    bzobj->d_device_capabilities = capabilities;
                    nm_assert(bzobj->d_device_capabilities == capabilities);
                }
                continue;
            }
            if (nm_streq(property_name, "Connected")) {
                bool v = g_variant_is_of_type(property_value, G_VARIANT_TYPE_BOOLEAN)
                         && g_variant_get_boolean(property_value);

                if (bzobj->d_device_connected != v) {
                    changed                   = TRUE;
                    bzobj->d_device_connected = v;
                }
                continue;
            }
            if (nm_streq(property_name, "Paired")) {
                bool v = g_variant_is_of_type(property_value, G_VARIANT_TYPE_BOOLEAN)
                         && g_variant_get_boolean(property_value);

                if (bzobj->d_device_paired != v) {
                    changed                = TRUE;
                    bzobj->d_device_paired = v;
                }
                continue;
            }
        }

        for (i = 0; (property_name = invalidated_properties[i]); i++) {
            if (nm_streq(property_name, "Address")) {
                if (bzobj->d_device.address) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_device.address);
                }
                continue;
            }
            if (nm_streq(property_name, "Name")) {
                if (bzobj->d_device.name) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_device.name);
                }
                continue;
            }
            if (nm_streq(property_name, "Adapter")) {
                if (bzobj->d_device.adapter) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_device.adapter);
                }
                continue;
            }
            if (nm_streq(property_name, "UUIDs")) {
                if (bzobj->d_device_capabilities != NM_BT_CAPABILITY_NONE) {
                    changed                      = TRUE;
                    bzobj->d_device_capabilities = NM_BT_CAPABILITY_NONE;
                }
                continue;
            }
            if (nm_streq(property_name, "Connected")) {
                if (bzobj->d_device_connected) {
                    changed                   = TRUE;
                    bzobj->d_device_connected = FALSE;
                }
                continue;
            }
            if (nm_streq(property_name, "Paired")) {
                if (bzobj->d_device_paired) {
                    changed                = TRUE;
                    bzobj->d_device_paired = FALSE;
                }
                continue;
            }
        }

    } else if (nm_streq(interface_name, NM_BLUEZ5_NETWORK_INTERFACE)) {
        _bzobjs_init(self, &bzobj, object_path);
        if (!bzobj->d_has_network_iface) {
            changed                    = TRUE;
            bzobj->d_has_network_iface = TRUE;
        }

        while (changed_properties
               && g_variant_iter_next(&iter_prop, "{&sv}", &property_name, &property_value)) {
            _nm_unused gs_unref_variant GVariant *property_value_free = property_value;

            if (nm_streq(property_name, "Interface")) {
                const char *s = g_variant_is_of_type(property_value, G_VARIANT_TYPE_STRING)
                                    ? g_variant_get_string(property_value, NULL)
                                    : NULL;

                if (!nm_streq0(bzobj->d_network.interface, s)) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_network.interface);
                    bzobj->d_network.interface = g_strdup(s);
                }
                continue;
            }
            if (nm_streq(property_name, "Connected")) {
                bool v = g_variant_is_of_type(property_value, G_VARIANT_TYPE_BOOLEAN)
                         && g_variant_get_boolean(property_value);

                if (bzobj->d_network_connected != v) {
                    changed                    = TRUE;
                    bzobj->d_network_connected = v;
                }
                continue;
            }
        }

        for (i = 0; (property_name = invalidated_properties[i]); i++) {
            if (nm_streq(property_name, "Interface")) {
                if (bzobj->d_network.interface) {
                    changed = TRUE;
                    nm_clear_g_free(&bzobj->d_network.interface);
                }
                continue;
            }
            if (nm_streq(property_name, "Connected")) {
                if (bzobj->d_network_connected) {
                    changed                    = TRUE;
                    bzobj->d_network_connected = FALSE;
                }
                continue;
            }
        }

    } else if (nm_streq(interface_name, NM_BLUEZ5_NETWORK_SERVER_INTERFACE)) {
        _bzobjs_init(self, &bzobj, object_path);
        if (!bzobj->d_has_network_server_iface) {
            changed                           = TRUE;
            bzobj->d_has_network_server_iface = TRUE;
        }
    }

    nm_assert(!changed || bzobj);

    if (inout_bzobj)
        *inout_bzobj = bzobj;

    return changed;
}

static void
_dbus_handle_interface_added(NMBluezManager *self,
                             const char     *object_path,
                             GVariant       *ifaces,
                             gboolean        initial_get_managed_objects)
{
    BzDBusObj   *bzobj   = NULL;
    gboolean     changed = FALSE;
    const char  *interface_name;
    GVariant    *changed_properties;
    GVariantIter iter_ifaces;

    nm_assert(g_variant_is_of_type(ifaces, G_VARIANT_TYPE("a{sa{sv}}")));

    g_variant_iter_init(&iter_ifaces, ifaces);
    while (g_variant_iter_next(&iter_ifaces, "{&s@a{sv}}", &interface_name, &changed_properties)) {
        _nm_unused gs_unref_variant GVariant *changed_properties_free = changed_properties;

        if (_dbus_handle_properties_changed(self,
                                            object_path,
                                            interface_name,
                                            changed_properties,
                                            NULL,
                                            &bzobj))
            changed = TRUE;
    }

    if (changed) {
        _dbus_process_changes(self,
                              bzobj,
                              initial_get_managed_objects ? "dbus-init" : "dbus-iface-added");
    }
}

static gboolean
_dbus_handle_interface_removed(NMBluezManager    *self,
                               const char        *object_path,
                               BzDBusObj        **inout_bzobj,
                               const char *const *removed_interfaces)
{
    gboolean   changed = FALSE;
    BzDBusObj *bzobj;
    gsize      i;

    if (inout_bzobj && *inout_bzobj) {
        bzobj = *inout_bzobj;
        nm_assert(bzobj == _bzobjs_get(self, object_path));
    } else {
        bzobj = _bzobjs_get(self, object_path);
        if (!bzobj)
            return FALSE;
        NM_SET_OUT(inout_bzobj, bzobj);
    }

    for (i = 0; removed_interfaces[i]; i++) {
        const char *interface_name = removed_interfaces[i];

        if (nm_streq(interface_name, NM_BLUEZ5_ADAPTER_INTERFACE)) {
            if (bzobj->d_has_adapter_iface) {
                changed                    = TRUE;
                bzobj->d_has_adapter_iface = FALSE;
            }
            if (bzobj->d_adapter.address) {
                changed = TRUE;
                nm_clear_g_free(&bzobj->d_adapter.address);
            }
            if (bzobj->d_adapter_powered) {
                changed                  = TRUE;
                bzobj->d_adapter_powered = FALSE;
            }
        } else if (nm_streq(interface_name, NM_BLUEZ5_DEVICE_INTERFACE)) {
            if (bzobj->d_has_device_iface) {
                changed                   = TRUE;
                bzobj->d_has_device_iface = FALSE;
            }
            if (bzobj->d_device.address) {
                changed = TRUE;
                nm_clear_g_free(&bzobj->d_device.address);
            }
            if (bzobj->d_device.name) {
                changed = TRUE;
                nm_clear_g_free(&bzobj->d_device.name);
            }
            if (bzobj->d_device.adapter) {
                changed = TRUE;
                nm_clear_g_free(&bzobj->d_device.adapter);
            }
            if (bzobj->d_device_capabilities != NM_BT_CAPABILITY_NONE) {
                changed                      = TRUE;
                bzobj->d_device_capabilities = NM_BT_CAPABILITY_NONE;
            }
            if (bzobj->d_device_connected) {
                changed                   = TRUE;
                bzobj->d_device_connected = FALSE;
            }
            if (bzobj->d_device_paired) {
                changed                = TRUE;
                bzobj->d_device_paired = FALSE;
            }
        } else if (nm_streq(interface_name, NM_BLUEZ5_NETWORK_INTERFACE)) {
            if (bzobj->d_has_network_iface) {
                changed                    = TRUE;
                bzobj->d_has_network_iface = FALSE;
            }
            if (bzobj->d_network.interface) {
                changed = TRUE;
                nm_clear_g_free(&bzobj->d_network.interface);
            }
            if (bzobj->d_network_connected) {
                changed                    = TRUE;
                bzobj->d_network_connected = FALSE;
            }
        } else if (nm_streq(interface_name, NM_BLUEZ5_NETWORK_SERVER_INTERFACE)) {
            if (bzobj->d_has_network_server_iface) {
                changed                           = TRUE;
                bzobj->d_has_network_server_iface = FALSE;
            }
        }
    }

    return changed;
}

static void
_dbus_managed_objects_changed_cb(GDBusConnection *connection,
                                 const char      *sender_name,
                                 const char      *arg_object_path,
                                 const char      *interface_name,
                                 const char      *signal_name,
                                 GVariant        *parameters,
                                 gpointer         user_data)
{
    NMBluezManager        *self  = user_data;
    NMBluezManagerPrivate *priv  = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    BzDBusObj             *bzobj = NULL;
    gboolean               changed;

    nm_assert(nm_streq0(interface_name, DBUS_INTERFACE_OBJECT_MANAGER));

    if (priv->get_managed_objects_cancellable) {
        /* we still wait for the initial GetManagedObjects(). Ignore the event. */
        return;
    }

    if (nm_streq(signal_name, "InterfacesAdded")) {
        gs_unref_variant GVariant *interfaces_and_properties = NULL;
        const char                *object_path;

        if (!g_variant_is_of_type(parameters, G_VARIANT_TYPE("(oa{sa{sv}})")))
            return;

        g_variant_get(parameters, "(&o@a{sa{sv}})", &object_path, &interfaces_and_properties);

        _dbus_handle_interface_added(self, object_path, interfaces_and_properties, FALSE);
        return;
    }

    if (nm_streq(signal_name, "InterfacesRemoved")) {
        gs_free const char **interfaces = NULL;
        const char          *object_path;

        if (!g_variant_is_of_type(parameters, G_VARIANT_TYPE("(oas)")))
            return;

        g_variant_get(parameters, "(&o^a&s)", &object_path, &interfaces);

        changed = _dbus_handle_interface_removed(self, object_path, &bzobj, interfaces);
        if (changed)
            _dbus_process_changes(self, bzobj, "dbus-iface-removed");
        return;
    }
}

static void
_dbus_properties_changed_cb(GDBusConnection *connection,
                            const char      *sender_name,
                            const char      *object_path,
                            const char      *signal_interface_name,
                            const char      *signal_name,
                            GVariant        *parameters,
                            gpointer         user_data)
{
    NMBluezManager            *self = user_data;
    NMBluezManagerPrivate     *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    const char                *interface_name;
    gs_unref_variant GVariant *changed_properties     = NULL;
    gs_free const char       **invalidated_properties = NULL;
    BzDBusObj                 *bzobj                  = NULL;

    if (priv->get_managed_objects_cancellable) {
        /* we still wait for the initial GetManagedObjects(). Ignore the event. */
        return;
    }

    if (!g_variant_is_of_type(parameters, G_VARIANT_TYPE("(sa{sv}as)")))
        return;

    g_variant_get(parameters,
                  "(&s@a{sv}^a&s)",
                  &interface_name,
                  &changed_properties,
                  &invalidated_properties);

    if (_dbus_handle_properties_changed(self,
                                        object_path,
                                        interface_name,
                                        changed_properties,
                                        invalidated_properties,
                                        &bzobj))
        _dbus_process_changes(self, bzobj, "dbus-property-changed");
}

static void
_dbus_get_managed_objects_cb(GVariant *result, GError *error, gpointer user_data)
{
    NMBluezManager        *self;
    NMBluezManagerPrivate *priv;
    GVariantIter           iter;
    const char            *object_path;
    GVariant              *ifaces;

    if (!result && nm_utils_error_is_cancelled(error))
        return;

    self = user_data;
    priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    g_clear_object(&priv->get_managed_objects_cancellable);

    if (!result) {
        _LOGT("initial GetManagedObjects() call failed: %s", error->message);
        _cleanup_for_name_owner(self);
        return;
    }

    _LOGT("initial GetManagedObjects call succeeded");

    g_variant_iter_init(&iter, result);
    while (g_variant_iter_next(&iter, "{&o@a{sa{sv}}}", &object_path, &ifaces)) {
        _nm_unused gs_unref_variant GVariant *ifaces_free = ifaces;

        _dbus_handle_interface_added(self, object_path, ifaces, TRUE);
    }
}

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

static void
_cleanup_for_name_owner(NMBluezManager *self)
{
    NMBluezManagerPrivate *priv                             = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    gboolean               emit_device_availability_changed = FALSE;
    GHashTableIter         iter;
    BzDBusObj             *bzobj;
    gboolean               first = TRUE;

    nm_clear_g_cancellable(&priv->get_managed_objects_cancellable);

    nm_clear_g_dbus_connection_signal(priv->dbus_connection, &priv->managed_objects_changed_id);
    nm_clear_g_dbus_connection_signal(priv->dbus_connection, &priv->properties_changed_id);

    nm_clear_g_free(&priv->name_owner);

    g_hash_table_iter_init(&iter, priv->bzobjs);
    while (g_hash_table_iter_next(&iter, (gpointer *) &bzobj, NULL)) {
        if (first) {
            first = FALSE;
            _LOGT("drop all objects form D-Bus cache...");
        }
        _dbus_handle_interface_removed(self,
                                       bzobj->object_path,
                                       &bzobj,
                                       ALL_RELEVANT_INTERFACE_NAMES);
        nm_c_list_move_tail(&priv->process_change_lst_head, &bzobj->process_change_lst);
    }
    _process_change_idle_all(self, &emit_device_availability_changed);
    nm_assert(g_hash_table_size(priv->bzobjs) == 0);

    if (emit_device_availability_changed)
        nm_manager_notify_device_availability_maybe_changed(priv->manager);
}

static void
name_owner_changed(NMBluezManager *self, const char *owner)
{
    _nm_unused gs_unref_object NMBluezManager *self_keep_alive = g_object_ref(self);
    NMBluezManagerPrivate                     *priv            = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    owner = nm_str_not_empty(owner);

    if (!owner)
        _LOGT("D-Bus name for bluez has no owner");
    else
        _LOGT("D-Bus name for bluez has owner %s", owner);

    nm_clear_g_cancellable(&priv->name_owner_get_cancellable);

    if (nm_streq0(priv->name_owner, owner))
        return;

    _cleanup_for_name_owner(self);

    if (!owner)
        return;

    priv->name_owner = g_strdup(owner);

    priv->get_managed_objects_cancellable = g_cancellable_new();

    priv->managed_objects_changed_id =
        nm_dbus_connection_signal_subscribe_object_manager(priv->dbus_connection,
                                                           priv->name_owner,
                                                           NM_BLUEZ_MANAGER_PATH,
                                                           NULL,
                                                           _dbus_managed_objects_changed_cb,
                                                           self,
                                                           NULL);

    priv->properties_changed_id =
        nm_dbus_connection_signal_subscribe_properties_changed(priv->dbus_connection,
                                                               priv->name_owner,
                                                               NULL,
                                                               NULL,
                                                               _dbus_properties_changed_cb,
                                                               self,
                                                               NULL);

    nm_dbus_connection_call_get_managed_objects(priv->dbus_connection,
                                                priv->name_owner,
                                                NM_BLUEZ_MANAGER_PATH,
                                                G_DBUS_CALL_FLAGS_NO_AUTO_START,
                                                20000,
                                                priv->get_managed_objects_cancellable,
                                                _dbus_get_managed_objects_cb,
                                                self);
}

static void
name_owner_changed_cb(GDBusConnection *connection,
                      const char      *sender_name,
                      const char      *object_path,
                      const char      *interface_name,
                      const char      *signal_name,
                      GVariant        *parameters,
                      gpointer         user_data)
{
    NMBluezManager *self = user_data;
    const char     *new_owner;

    if (!g_variant_is_of_type(parameters, G_VARIANT_TYPE("(sss)")))
        return;

    g_variant_get(parameters, "(&s&s&s)", NULL, NULL, &new_owner);

    name_owner_changed(self, new_owner);
}

static void
name_owner_get_cb(const char *name_owner, GError *error, gpointer user_data)
{
    if (name_owner || !g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
        name_owner_changed(user_data, name_owner);
}

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

static void
_cleanup_all(NMBluezManager *self)
{
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    priv->settings_registered = FALSE;

    g_signal_handlers_disconnect_by_func(priv->settings, cp_connection_added, self);
    g_signal_handlers_disconnect_by_func(priv->settings, cp_connection_updated, self);
    g_signal_handlers_disconnect_by_func(priv->settings, cp_connection_removed, self);

    g_hash_table_remove_all(priv->conn_data_elems);
    g_hash_table_remove_all(priv->conn_data_heads);

    _cleanup_for_name_owner(self);

    nm_clear_g_cancellable(&priv->name_owner_get_cancellable);

    nm_clear_g_dbus_connection_signal(priv->dbus_connection, &priv->name_owner_changed_id);
}

static void
start(NMDeviceFactory *factory)
{
    NMBluezManager              *self;
    NMBluezManagerPrivate       *priv;
    NMSettingsConnection *const *sett_conns;
    guint                        n_sett_conns;
    guint                        i;

    g_return_if_fail(NM_IS_BLUEZ_MANAGER(factory));

    self = NM_BLUEZ_MANAGER(factory);
    priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    _cleanup_all(self);

    if (!priv->dbus_connection) {
        _LOGI("no D-Bus connection available");
        return;
    }

    g_signal_connect(priv->settings,
                     NM_SETTINGS_SIGNAL_CONNECTION_ADDED,
                     G_CALLBACK(cp_connection_added),
                     self);
    g_signal_connect(priv->settings,
                     NM_SETTINGS_SIGNAL_CONNECTION_UPDATED,
                     G_CALLBACK(cp_connection_updated),
                     self);
    g_signal_connect(priv->settings,
                     NM_SETTINGS_SIGNAL_CONNECTION_REMOVED,
                     G_CALLBACK(cp_connection_removed),
                     self);

    priv->settings_registered = TRUE;

    sett_conns = nm_settings_get_connections(priv->settings, &n_sett_conns);
    for (i = 0; i < n_sett_conns; i++)
        _conn_track_update(self, sett_conns[i], TRUE, NULL, NULL, NULL);

    priv->name_owner_changed_id =
        nm_dbus_connection_signal_subscribe_name_owner_changed(priv->dbus_connection,
                                                               NM_BLUEZ_SERVICE,
                                                               name_owner_changed_cb,
                                                               self,
                                                               NULL);

    priv->name_owner_get_cancellable = g_cancellable_new();

    nm_dbus_connection_call_get_name_owner(priv->dbus_connection,
                                           NM_BLUEZ_SERVICE,
                                           10000,
                                           priv->name_owner_get_cancellable,
                                           name_owner_get_cb,
                                           self);
}

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

static void
_connect_returned(NMBluezManager         *self,
                  BzDBusObj              *bzobj,
                  NMBluetoothCapabilities bt_type,
                  const char             *device_name,
                  NMBluez5DunContext     *dun_context,
                  GError                 *error)
{
    char sbuf_cap[100];

    if (error) {
        nm_assert(!device_name);
        nm_assert(!dun_context);

        _LOGI("%s [%s]: connect failed: %s",
              nm_bluetooth_capability_to_string(bzobj->x_device_connect_bt_type,
                                                sbuf_cap,
                                                sizeof(sbuf_cap)),
              bzobj->object_path,
              error->message);

        _device_connect_req_data_complete(g_steal_pointer(&bzobj->x_device.c_req_data),
                                          self,
                                          NULL,
                                          error);
        _connect_disconnect(self, bzobj, "cleanup after connect failure");
        return;
    }

    nm_assert(bzobj->x_device_connect_bt_type == bt_type);
    nm_assert(device_name);
    nm_assert((bt_type == NM_BT_CAPABILITY_DUN) == (!!dun_context));
    nm_assert(bzobj->x_device.c_req_data);

    g_clear_object(&bzobj->x_device.c_req_data->int_cancellable);

    bzobj->x_device.connect_dun_context = dun_context;

    _LOGD("%s [%s]: connect successful to device %s",
          nm_bluetooth_capability_to_string(bzobj->x_device_connect_bt_type,
                                            sbuf_cap,
                                            sizeof(sbuf_cap)),
          bzobj->object_path,
          device_name);

    /* we already have another over-all timer running. But after we connected the device,
     * we still need to wait for bluez to acknowledge the connected state (via D-Bus, for NAP).
     * For DUN profiles we likely are already fully connected by now.
     *
     * Anyway, schedule another timeout that is possibly shorter than the overall, original
     * timeout. Now this should go down fast. */
    bzobj->x_device.c_req_data->timeout_wait_connect_id =
        g_timeout_add(5000, _connect_timeout_wait_connected_cb, bzobj),
    bzobj->x_device.c_req_data->device_name = g_strdup(device_name);

    if (_bzobjs_device_is_usable(bzobj, NULL, NULL) && _bzobjs_device_is_connected(bzobj)) {
        /* We are now connected. Schedule the task that completes the state. */
        _process_change_idle_schedule(self, bzobj);
    }
}

#if WITH_BLUEZ5_DUN
static void
_connect_dun_notify_tty_hangup_cb(NMBluez5DunContext *context, gpointer user_data)
{
    BzDBusObj *bzobj = user_data;

    _connect_disconnect(bzobj->self, bzobj, "DUN connection hung up");
}

static void
_connect_dun_step2_cb(NMBluez5DunContext *context,
                      const char         *rfcomm_dev,
                      GError             *error,
                      gpointer            user_data)
{
    BzDBusObj *bzobj;

    if (nm_utils_error_is_cancelled(error))
        return;

    bzobj = user_data;

    if (rfcomm_dev) {
        /* We want to early notify about the rfcomm path. That is because we might still delay
         * to signal full activation longer (asynchronously). But the earliest time the callback
         * is invoked with the rfcomm path, we just created the device synchronously.
         *
         * By already notifying the caller about the path early, it avoids a race where ModemManager
         * would find the modem before the bluetooth code considers the profile fully activated. */

        nm_assert(!error);
        nm_assert(bzobj->x_device.c_req_data);

        if (!g_cancellable_is_cancelled(bzobj->x_device.c_req_data->ext_cancellable))
            bzobj->x_device.c_req_data->callback(bzobj->self,
                                                 FALSE,
                                                 rfcomm_dev,
                                                 NULL,
                                                 bzobj->x_device.c_req_data->callback_user_data);

        if (!context) {
            /* No context set. This means, we just got notified about the rfcomm path and need to wait
             * longer, for the next callback. */
            return;
        }
    }

    _connect_returned(bzobj->self, bzobj, NM_BT_CAPABILITY_DUN, rfcomm_dev, context, error);
}

static void
_connect_dun_step1_cb(GObject *source_object, GAsyncResult *res, gpointer user_data)
{
    gs_unref_variant GVariant *ret   = NULL;
    gs_free_error GError      *error = NULL;
    BzDBusObj                 *bzobj_adapter;
    BzDBusObj                 *bzobj;

    ret = g_dbus_connection_call_finish(G_DBUS_CONNECTION(source_object), res, &error);

    if (!ret && nm_utils_error_is_cancelled(error))
        return;

    bzobj = user_data;

    if (error) {
        _LOGT("DUN: [%s]: bluetooth device connect failed: %s", bzobj->object_path, error->message);
        /* we actually ignore this error. Let's try, maybe we still can connect via DUN. */
        g_clear_error(&error);
    } else
        _LOGT("DUN: [%s]: bluetooth device connected successfully", bzobj->object_path);

    if (!_bzobjs_device_is_usable(bzobj, &bzobj_adapter, NULL)) {
        nm_utils_error_set(&error,
                           NM_UTILS_ERROR_UNKNOWN,
                           "device %s is not usable for DUN after connect",
                           bzobj->object_path);
        _connect_returned(bzobj->self, bzobj, NM_BT_CAPABILITY_DUN, NULL, NULL, error);
        return;
    }

    if (!nm_bluez5_dun_connect(bzobj_adapter->d_adapter.address,
                               bzobj->d_device.address,
                               bzobj->x_device.c_req_data->int_cancellable,
                               _connect_dun_step2_cb,
                               bzobj,
                               _connect_dun_notify_tty_hangup_cb,
                               bzobj,
                               &error)) {
        _connect_returned(bzobj->self, bzobj, NM_BT_CAPABILITY_DUN, NULL, NULL, error);
        return;
    }
}
#endif

static void
_connect_nap_cb(GObject *source_object, GAsyncResult *res, gpointer user_data)
{
    gs_unref_variant GVariant *ret                = NULL;
    const char                *network_iface_name = NULL;
    gs_free_error GError      *error              = NULL;
    BzDBusObj                 *bzobj;

    ret = g_dbus_connection_call_finish(G_DBUS_CONNECTION(source_object), res, &error);

    if (!ret && nm_utils_error_is_cancelled(error))
        return;

    if (ret)
        g_variant_get(ret, "(&s)", &network_iface_name);

    bzobj = user_data;

    _connect_returned(bzobj->self, bzobj, NM_BT_CAPABILITY_NAP, network_iface_name, NULL, error);
}

static void
_connect_cancelled_cb(GCancellable *cancellable, BzDBusObj *bzobj)
{
    _connect_disconnect(bzobj->self, bzobj, "connect cancelled");
}

static gboolean
_connect_timeout_wait_connected_cb(gpointer user_data)
{
    BzDBusObj *bzobj = user_data;

    bzobj->x_device.c_req_data->timeout_wait_connect_id = 0;
    _connect_disconnect(bzobj->self, bzobj, "timeout waiting for connected");
    return G_SOURCE_REMOVE;
}

static gboolean
_connect_timeout_cb(gpointer user_data)
{
    BzDBusObj *bzobj = user_data;

    bzobj->x_device.c_req_data->timeout_id = 0;
    _connect_disconnect(bzobj->self, bzobj, "timeout connecting");
    return G_SOURCE_REMOVE;
}

static void
_connect_disconnect(NMBluezManager *self, BzDBusObj *bzobj, const char *reason)
{
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);
    DeviceConnectReqData  *c_req_data;
    char                   sbuf_cap[100];
    gboolean               bt_type;

    if (bzobj->x_device_connect_bt_type == NM_BT_CAPABILITY_NONE) {
        nm_assert(!bzobj->x_device.c_req_data);
        return;
    }

    bt_type = bzobj->x_device_connect_bt_type;
    nm_assert(NM_IN_SET(bt_type, NM_BT_CAPABILITY_DUN, NM_BT_CAPABILITY_NAP));
    bzobj->x_device_connect_bt_type = NM_BT_CAPABILITY_NONE;

    c_req_data = g_steal_pointer(&bzobj->x_device.c_req_data);

    _LOGD("%s [%s]: disconnect due to %s",
          nm_bluetooth_capability_to_string(bt_type, sbuf_cap, sizeof(sbuf_cap)),
          bzobj->object_path,
          reason);

    if (c_req_data)
        nm_clear_g_cancellable(&c_req_data->int_cancellable);

    if (bt_type == NM_BT_CAPABILITY_DUN) {
        /* For DUN devices, we also called org.bluez.Device1.Connect() (because in order
         * for nm_bluez5_dun_connect() to succeed, we need to be already connected *why??).
         *
         * But upon disconnect we don't call Disconnect() because we don't know whether somebody
         * else also uses the bluetooth device for other purposes. During disconnect we only
         * terminate the DUN connection, but don't disconnect entirely. I think that's the
         * best we can do. */
#if WITH_BLUEZ5_DUN
        nm_clear_pointer(&bzobj->x_device.connect_dun_context, nm_bluez5_dun_disconnect);
#else
        nm_assert_not_reached();
#endif
    } else {
        if (priv->name_owner) {
            gs_unref_object GCancellable *cancellable = NULL;

            cancellable = g_cancellable_new();

            nm_shutdown_wait_obj_register_cancellable_full(
                cancellable,
                g_strdup_printf("bt-disconnect-nap[%s]", bzobj->object_path),
                TRUE);

            g_dbus_connection_call(priv->dbus_connection,
                                   priv->name_owner,
                                   bzobj->object_path,
                                   NM_BLUEZ5_NETWORK_INTERFACE,
                                   "Disconnect",
                                   g_variant_new("()"),
                                   NULL,
                                   G_DBUS_CALL_FLAGS_NO_AUTO_START,
                                   -1,
                                   cancellable,
                                   _dbus_call_complete_cb_nop,
                                   NULL);
        }
    }

    if (c_req_data) {
        gs_free_error GError *error = NULL;

        nm_utils_error_set(&error, NM_UTILS_ERROR_UNKNOWN, "connect aborted due to %s", reason);
        _device_connect_req_data_complete(c_req_data, self, NULL, error);
    }
}

gboolean
nm_bluez_manager_connect(NMBluezManager         *self,
                         const char             *object_path,
                         NMBluetoothCapabilities connection_bt_type,
                         int                     timeout_msec,
                         GCancellable           *cancellable,
                         NMBluezManagerConnectCb callback,
                         gpointer                callback_user_data,
                         GError                **error)
{
    gs_unref_object GCancellable *int_cancellable = NULL;
    DeviceConnectReqData         *c_req_data;
    NMBluezManagerPrivate        *priv;
    BzDBusObj                    *bzobj;
    char                          sbuf_cap[100];

    g_return_val_if_fail(NM_IS_BLUEZ_MANAGER(self), FALSE);
    g_return_val_if_fail(NM_IN_SET(connection_bt_type, NM_BT_CAPABILITY_DUN, NM_BT_CAPABILITY_NAP),
                         FALSE);
    g_return_val_if_fail(callback, FALSE);

    nm_assert(timeout_msec > 0);

    priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    bzobj = _bzobjs_get(self, object_path);

    if (!bzobj) {
        nm_utils_error_set(error, NM_UTILS_ERROR_UNKNOWN, "device %s does not exist", object_path);
        return FALSE;
    }

    if (!_bzobjs_device_is_usable(bzobj, NULL, NULL)) {
        nm_utils_error_set(error, NM_UTILS_ERROR_UNKNOWN, "device %s is not usable", object_path);
        return FALSE;
    }

    if (!NM_FLAGS_ALL(bzobj->d_device_capabilities, connection_bt_type)) {
        nm_utils_error_set(error,
                           NM_UTILS_ERROR_UNKNOWN,
                           "device %s has not the required capabilities",
                           object_path);
        return FALSE;
    }

#if !WITH_BLUEZ5_DUN
    if (connection_bt_type == NM_BT_CAPABILITY_DUN) {
        nm_utils_error_set(error, NM_UTILS_ERROR_UNKNOWN, "DUN is not supported");
        return FALSE;
    }
#endif

    _connect_disconnect(self, bzobj, "new activation");

    _LOGD("%s [%s]: connecting...",
          nm_bluetooth_capability_to_string(connection_bt_type, sbuf_cap, sizeof(sbuf_cap)),
          bzobj->object_path);

    int_cancellable = g_cancellable_new();

#if WITH_BLUEZ5_DUN
    if (connection_bt_type == NM_BT_CAPABILITY_DUN) {
        g_dbus_connection_call(priv->dbus_connection,
                               priv->name_owner,
                               bzobj->object_path,
                               NM_BLUEZ5_DEVICE_INTERFACE,
                               "Connect",
                               NULL,
                               NULL,
                               G_DBUS_CALL_FLAGS_NO_AUTO_START,
                               timeout_msec,
                               int_cancellable,
                               _connect_dun_step1_cb,
                               bzobj);
    } else
#endif
    {
        nm_assert(connection_bt_type == NM_BT_CAPABILITY_NAP);
        g_dbus_connection_call(priv->dbus_connection,
                               priv->name_owner,
                               bzobj->object_path,
                               NM_BLUEZ5_NETWORK_INTERFACE,
                               "Connect",
                               g_variant_new("(s)", BLUETOOTH_CONNECT_NAP),
                               G_VARIANT_TYPE("(s)"),
                               G_DBUS_CALL_FLAGS_NO_AUTO_START,
                               timeout_msec,
                               int_cancellable,
                               _connect_nap_cb,
                               bzobj);
    }

    c_req_data  = g_slice_new(DeviceConnectReqData);
    *c_req_data = (DeviceConnectReqData){
        .int_cancellable    = g_steal_pointer(&int_cancellable),
        .ext_cancellable    = g_object_ref(cancellable),
        .callback           = callback,
        .callback_user_data = callback_user_data,
        .ext_cancelled_id =
            g_signal_connect(cancellable, "cancelled", G_CALLBACK(_connect_cancelled_cb), bzobj),
        .timeout_id = g_timeout_add(timeout_msec, _connect_timeout_cb, bzobj),
    };

    bzobj->x_device_connect_bt_type = connection_bt_type;
    bzobj->x_device.c_req_data      = c_req_data;

    return TRUE;
}

void
nm_bluez_manager_disconnect(NMBluezManager *self, const char *object_path)
{
    BzDBusObj *bzobj;

    g_return_if_fail(NM_IS_BLUEZ_MANAGER(self));
    g_return_if_fail(object_path);

    bzobj = _bzobjs_get(self, object_path);
    if (!bzobj)
        return;

    _connect_disconnect(self, bzobj, "disconnected by user");
}

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

static NMDevice *
create_device(NMDeviceFactory      *factory,
              const char           *iface,
              const NMPlatformLink *plink,
              NMConnection         *connection,
              gboolean             *out_ignore)
{
    *out_ignore = TRUE;
    g_return_val_if_fail(plink->type == NM_LINK_TYPE_BNEP, NULL);
    return NULL;
}

static gboolean
match_connection(NMDeviceFactory *factory, NMConnection *connection)
{
    const char *type = nm_connection_get_connection_type(connection);

    nm_assert(nm_streq(type, NM_SETTING_BLUETOOTH_SETTING_NAME));

    if (_nm_connection_get_setting_bluetooth_for_nap(connection))
        return FALSE; /* handled by the bridge factory */

    return TRUE;
}

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

static void
nm_bluez_manager_init(NMBluezManager *self)
{
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    priv->vtable_network_server = (NMBtVTableNetworkServer){
        .is_available      = _network_server_vt_is_available,
        .register_bridge   = _network_server_vt_register_bridge,
        .unregister_bridge = _network_server_vt_unregister_bridge,
    };

    c_list_init(&priv->network_server_lst_head);
    c_list_init(&priv->process_change_lst_head);

    priv->conn_data_heads =
        g_hash_table_new_full(_conn_data_head_hash, _conn_data_head_equal, g_free, NULL);
    priv->conn_data_elems = g_hash_table_new_full(nm_pdirect_hash,
                                                  nm_pdirect_equal,
                                                  nm_g_slice_free_fcn(ConnDataElem),
                                                  NULL);

    priv->bzobjs = g_hash_table_new_full(nm_pstr_hash,
                                         nm_pstr_equal,
                                         (GDestroyNotify) _bz_dbus_obj_free,
                                         NULL);

    priv->manager         = g_object_ref(NM_MANAGER_GET);
    priv->settings        = g_object_ref(NM_SETTINGS_GET);
    priv->dbus_connection = nm_g_object_ref(NM_MAIN_DBUS_CONNECTION_GET);

    g_atomic_pointer_compare_and_exchange(&nm_bt_vtable_network_server,
                                          NULL,
                                          &priv->vtable_network_server);
}

static void
dispose(GObject *object)
{
    NMBluezManager        *self = NM_BLUEZ_MANAGER(object);
    NMBluezManagerPrivate *priv = NM_BLUEZ_MANAGER_GET_PRIVATE(self);

    /* FIXME(shutdown): we need a nm_device_factory_stop() hook to first unregister all
     *   BzDBusObj instances and do necessary cleanup actions (like disconnecting devices
     *   or deleting panu_connection). */

    nm_clear_g_source(&priv->process_change_idle_id);

    g_atomic_pointer_compare_and_exchange(&nm_bt_vtable_network_server,
                                          &priv->vtable_network_server,
                                          NULL);

    _cleanup_all(self);

    G_OBJECT_CLASS(nm_bluez_manager_parent_class)->dispose(object);

    g_clear_object(&priv->settings);
    g_clear_object(&priv->manager);
    g_clear_object(&priv->dbus_connection);

    nm_clear_pointer(&priv->bzobjs, g_hash_table_destroy);
    nm_clear_pointer(&priv->conn_data_heads, g_hash_table_destroy);
    nm_clear_pointer(&priv->conn_data_elems, g_hash_table_destroy);

    nm_assert(c_list_is_empty(&priv->network_server_lst_head));
    nm_assert(c_list_is_empty(&priv->process_change_lst_head));
}

static void
nm_bluez_manager_class_init(NMBluezManagerClass *klass)
{
    GObjectClass         *object_class  = G_OBJECT_CLASS(klass);
    NMDeviceFactoryClass *factory_class = NM_DEVICE_FACTORY_CLASS(klass);

    object_class->dispose = dispose;

    factory_class->get_supported_types = get_supported_types;
    factory_class->create_device       = create_device;
    factory_class->match_connection    = match_connection;
    factory_class->start               = start;
}
