path: root/libnm-util/nm-setting.c

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */

/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 * Copyright 2007 - 2011 Red Hat, Inc.
 * Copyright 2007 - 2008 Novell, Inc.
 */

#include "config.h"

#include <string.h>
#include <glib/gi18n-lib.h>

#include "nm-setting.h"
#include "nm-setting-private.h"
#include "nm-setting-connection.h"
#include "nm-utils.h"
#include "nm-utils-private.h"

/**
 * SECTION:nm-setting
 * @short_description: Describes related configuration information
 * @include: nm-setting.h
 *
 * Each #NMSetting contains properties that describe configuration that applies
 * to a specific network layer (like IPv4 or IPv6 configuration) or device type
 * (like Ethernet, or Wi-Fi).  A collection of individual settings together
 * make up an #NMConnection. Each property is strongly typed and usually has
 * a number of allowed values.  See each #NMSetting subclass for a description
 * of properties and allowed values.
 */

/**
 * nm_setting_error_quark:
 *
 * Registers an error quark for #NMSetting if necessary.
 *
 * Returns: the error quark used for NMSetting errors.
 **/
GQuark
nm_setting_error_quark (void)
{
	static GQuark quark;

	if (G_UNLIKELY (!quark))
		quark = g_quark_from_static_string ("nm-setting-error-quark");
	return quark;
}

G_DEFINE_ABSTRACT_TYPE (NMSetting, nm_setting, G_TYPE_OBJECT)

#define NM_SETTING_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_SETTING, NMSettingPrivate))

typedef struct {
	const char *name;
	GType type;
	guint32 priority;
	GQuark error_quark;
} SettingInfo;

typedef struct {
	const SettingInfo *info;
} NMSettingPrivate;

enum {
	PROP_0,
	PROP_NAME,

	PROP_LAST
};

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

static GHashTable *registered_settings = NULL;
static GHashTable *registered_settings_by_type = NULL;

static gboolean
_nm_gtype_equal (gconstpointer v1, gconstpointer v2)
{
	return *((const GType *) v1) == *((const GType *) v2);
}
static guint
_nm_gtype_hash (gconstpointer v)
{
	return *((const GType *) v);
}

static void
_ensure_registered (void)
{
	if (G_UNLIKELY (registered_settings == NULL)) {
#if !GLIB_CHECK_VERSION (2, 35, 0)
		g_type_init ();
#endif
		_nm_value_transforms_register ();
		registered_settings = g_hash_table_new (g_str_hash, g_str_equal);
		registered_settings_by_type = g_hash_table_new (_nm_gtype_hash, _nm_gtype_equal);
	}
}

static void __attribute__((constructor))
_ensure_registered_constructor (void)
{
	_ensure_registered ();
}

#define _ensure_setting_info(self, priv) \
	G_STMT_START { \
		NMSettingPrivate *_priv_esi = (priv); \
		if (G_UNLIKELY (!_priv_esi->info)) { \
			_priv_esi->info = _nm_setting_lookup_setting_by_type (G_OBJECT_TYPE (self)); \
			g_assert (_priv_esi->info); \
		} \
	} G_STMT_END

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

/*
 * _nm_register_setting:
 * @name: the name of the #NMSetting object to register
 * @type: the #GType of the #NMSetting
 * @priority: the sort priority of the setting, see below
 * @error_quark: the setting's error quark
 *
 * INTERNAL ONLY: registers a setting's internal properties, like its priority
 * and its error quark type, with libnm-util.
 *
 * A setting's priority should roughly follow the OSI layer model, but it also
 * controls which settings get asked for secrets first.  Thus settings which
 * relate to things that must be working first, like hardware, should get a
 * higher priority than things which layer on top of the hardware.  For example,
 * the GSM/CDMA settings should provide secrets before the PPP setting does,
 * because a PIN is required to unlock the device before PPP can even start.
 * Even settings without secrets should be assigned the right priority.
 *
 * 0: reserved for the Connection setting
 *
 * 1: hardware-related settings like Ethernet, Wi-Fi, InfiniBand, Bridge, etc.
 * These priority 1 settings are also "base types", which means that at least
 * one of them is required for the connection to be valid, and their name is
 * valid in the 'type' property of the Connection setting.
 *
 * 2: hardware-related auxiliary settings that require a base setting to be
 * successful first, like Wi-Fi security, 802.1x, etc.
 *
 * 3: hardware-independent settings that are required before IP connectivity
 * can be established, like PPP, PPPoE, etc.
 *
 * 4: IP-level stuff
 */
void
(_nm_register_setting) (const char *name,
                        const GType type,
                        const guint32 priority,
                        const GQuark error_quark)
{
	SettingInfo *info;

	g_return_if_fail (name != NULL && *name);
	g_return_if_fail (type != G_TYPE_INVALID);
	g_return_if_fail (type != G_TYPE_NONE);
	g_return_if_fail (error_quark != 0);
	g_return_if_fail (priority <= 4);

	_ensure_registered ();

	if (G_LIKELY ((info = g_hash_table_lookup (registered_settings, name)))) {
		g_return_if_fail (info->type == type);
		g_return_if_fail (info->error_quark == error_quark);
		g_return_if_fail (info->priority == priority);
		g_return_if_fail (g_strcmp0 (info->name, name) == 0);
		return;
	}
	g_return_if_fail (g_hash_table_lookup (registered_settings_by_type, &type) == NULL);

	if (priority == 0)
		g_assert_cmpstr (name, ==, NM_SETTING_CONNECTION_SETTING_NAME);

	info = g_slice_new0 (SettingInfo);
	info->type = type;
	info->priority = priority;
	info->error_quark = error_quark;
	info->name = name;
	g_hash_table_insert (registered_settings, (void *) info->name, info);
	g_hash_table_insert (registered_settings_by_type, &info->type, info);
}

static const SettingInfo *
_nm_setting_lookup_setting_by_type (GType type)
{
	_ensure_registered ();
	return g_hash_table_lookup (registered_settings_by_type, &type);
}

static guint32
_get_setting_type_priority (GType type)
{
	const SettingInfo *info;

	g_return_val_if_fail (g_type_is_a (type, NM_TYPE_SETTING), G_MAXUINT32);

	info = _nm_setting_lookup_setting_by_type (type);
	return info->priority;
}

guint32
_nm_setting_get_setting_priority (NMSetting *setting)
{
	NMSettingPrivate *priv;

	g_return_val_if_fail (NM_IS_SETTING (setting), G_MAXUINT32);
	priv = NM_SETTING_GET_PRIVATE (setting);
	_ensure_setting_info (setting, priv);
	return priv->info->priority;
}

gboolean
_nm_setting_type_is_base_type (GType type)
{
	/* Historical oddity: PPPoE is a base-type even though it's not
	 * priority 1.  It needs to be sorted *after* lower-level stuff like
	 * Wi-Fi security or 802.1x for secrets, but it's still allowed as a
	 * base type.
	 */
	return _get_setting_type_priority (type) == 1 || (type == NM_TYPE_SETTING_PPPOE);
}

gboolean
_nm_setting_is_base_type (NMSetting *setting)
{
	return _nm_setting_type_is_base_type (G_OBJECT_TYPE (setting));
}

GType
_nm_setting_lookup_setting_type (const char *name)
{
	SettingInfo *info;

	g_return_val_if_fail (name != NULL, G_TYPE_NONE);

	_ensure_registered ();

	info = g_hash_table_lookup (registered_settings, name);
	return info ? info->type : G_TYPE_INVALID;
}

GType
_nm_setting_lookup_setting_type_by_quark (GQuark error_quark)
{
	SettingInfo *info;
	GHashTableIter iter;

	_ensure_registered ();

	g_hash_table_iter_init (&iter, registered_settings);
	while (g_hash_table_iter_next (&iter, NULL, (gpointer) &info)) {
		if (info->error_quark == error_quark)
			return info->type;
	}
	return G_TYPE_INVALID;
}

gint
_nm_setting_compare_priority (gconstpointer a, gconstpointer b)
{
	guint32 prio_a, prio_b;

	prio_a = _nm_setting_get_setting_priority ((NMSetting *) a);
	prio_b = _nm_setting_get_setting_priority ((NMSetting *) b);

	if (prio_a < prio_b)
		return -1;
	else if (prio_a == prio_b)
		return 0;
	return 1;
}

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

static void
destroy_gvalue (gpointer data)
{
	GValue *value = (GValue *) data;

	g_value_unset (value);
	g_slice_free (GValue, value);
}

/**
 * nm_setting_to_hash:
 * @setting: the #NMSetting
 * @flags: hash flags, e.g. %NM_SETTING_HASH_FLAG_ALL
 *
 * Converts the #NMSetting into a #GHashTable mapping each setting property
 * name to a GValue describing that property, suitable for marshalling over
 * D-Bus or serializing.  The mapping is string to GValue.
 *
 * Returns: (transfer full) (element-type utf8 GObject.Value): a new #GHashTable
 * describing the setting's properties
 **/
GHashTable *
nm_setting_to_hash (NMSetting *setting, NMSettingHashFlags flags)
{
	GHashTable *hash;
	GParamSpec **property_specs;
	guint n_property_specs;
	guint i;

	g_return_val_if_fail (NM_IS_SETTING (setting), NULL);

	property_specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (setting), &n_property_specs);

	hash = g_hash_table_new_full (g_str_hash, g_str_equal,
	                              (GDestroyNotify) g_free, destroy_gvalue);

	for (i = 0; i < n_property_specs; i++) {
		GParamSpec *prop_spec = property_specs[i];
		GValue *value;

		/* 'name' doesn't get serialized */
		if (strcmp (g_param_spec_get_name (prop_spec), NM_SETTING_NAME) == 0)
			continue;

		if (   (flags & NM_SETTING_HASH_FLAG_NO_SECRETS)
		    && (prop_spec->flags & NM_SETTING_PARAM_SECRET))
			continue;

		if (   (flags & NM_SETTING_HASH_FLAG_ONLY_SECRETS)
		    && !(prop_spec->flags & NM_SETTING_PARAM_SECRET))
			continue;

		value = g_slice_new0 (GValue);
		g_value_init (value, prop_spec->value_type);
		g_object_get_property (G_OBJECT (setting), prop_spec->name, value);

		/* Don't serialize values with default values */
		if (!g_param_value_defaults (prop_spec, value))
			g_hash_table_insert (hash, g_strdup (prop_spec->name), value);
		else
			destroy_gvalue (value);
	}
	g_free (property_specs);

	return hash;
}

/**
 * nm_setting_new_from_hash:
 * @setting_type: the #NMSetting type which the hash contains properties for
 * @hash: (element-type utf8 GObject.Value): the #GHashTable containing a
 * string to GValue mapping of properties that apply to the setting
 *
 * Creates a new #NMSetting object and populates that object with the properties
 * contained in the hash table, using each hash key as the property to set,
 * and each hash value as the value to set that property to.  Setting properties
 * are strongly typed, thus the GValue type of the hash value must be correct.
 * See the documentation on each #NMSetting object subclass for the correct
 * property names and value types.
 *
 * Returns: a new #NMSetting object populated with the properties from the
 * hash table, or %NULL on failure
 **/
NMSetting *
nm_setting_new_from_hash (GType setting_type, GHashTable *hash)
{
	GHashTableIter iter;
	NMSetting *setting;
	const char *prop_name;
	GValue *src_value;
	GObjectClass *class;
	guint n_params = 0;
	GParameter *params;
	int i;

	g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (setting_type), NULL);
	g_return_val_if_fail (hash != NULL, NULL);

	/* g_type_class_ref() ensures the setting class is created if it hasn't
	 * already been used.
	 */
	class = g_type_class_ref (setting_type);
	params = g_new0 (GParameter, g_hash_table_size (hash));

	g_hash_table_iter_init (&iter, hash);
	while (g_hash_table_iter_next (&iter, (gpointer) &prop_name, (gpointer) &src_value)) {
		GValue *dst_value = &params[n_params].value;
		GParamSpec *param_spec;

		param_spec = g_object_class_find_property (class, prop_name);
		if (!param_spec) {
			/* Assume that any unrecognized property either can be ignored, or
			 * else has a backward-compatibility equivalent.
			 */
			g_debug ("Ignoring unrecognized property '%s'", prop_name);
			continue;
		}

		g_value_init (dst_value, G_VALUE_TYPE (src_value));
		g_value_copy (src_value, dst_value);
		params[n_params++].name = prop_name;
	}

	setting = (NMSetting *) g_object_newv (setting_type, n_params, params);

	for (i = 0; i < n_params; i++)
		g_value_unset (&params[i].value);

	g_free (params);
	g_type_class_unref (class);

	return setting;
}

gboolean
_nm_setting_get_property (NMSetting *setting, const char *property_name, GValue *value)
{
	GParamSpec *prop_spec;

	g_return_val_if_fail (NM_IS_SETTING (setting), FALSE);
	g_return_val_if_fail (property_name, FALSE);
	g_return_val_if_fail (value, FALSE);

	prop_spec = g_object_class_find_property (G_OBJECT_GET_CLASS (setting), property_name);

	if (!prop_spec) {
		g_value_unset (value);
		return FALSE;
	}

	g_value_init (value, prop_spec->value_type);
	g_object_get_property (G_OBJECT (setting), property_name, value);
	return TRUE;
}

static void
duplicate_setting (NMSetting *setting,
                   const char *name,
                   const GValue *value,
                   GParamFlags flags,
                   gpointer user_data)
{
	if ((flags & (G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY)) == G_PARAM_WRITABLE)
		g_object_set_property (G_OBJECT (user_data), name, value);
}

/**
 * nm_setting_duplicate:
 * @setting: the #NMSetting to duplicate
 *
 * Duplicates a #NMSetting.
 *
 * Returns: (transfer full): a new #NMSetting containing the same properties and values as the
 * source #NMSetting
 **/
NMSetting *
nm_setting_duplicate (NMSetting *setting)
{
	GObject *dup;

	g_return_val_if_fail (NM_IS_SETTING (setting), NULL);

	dup = g_object_new (G_OBJECT_TYPE (setting), NULL);

	g_object_freeze_notify (dup);
	nm_setting_enumerate_values (setting, duplicate_setting, dup);
	g_object_thaw_notify (dup);

	return NM_SETTING (dup);
}

static gint
find_setting_by_name (gconstpointer a, gconstpointer b)
{
	NMSetting *setting = NM_SETTING (a);
	const char *str = (const char *) b;

	return strcmp (nm_setting_get_name (setting), str);
}

NMSetting *
nm_setting_find_in_list (GSList     *settings_list,
                         const char *setting_name)
{
	GSList *found;

	found = g_slist_find_custom (settings_list, setting_name, find_setting_by_name);
	if (found)
		return found->data;
	else
		return NULL;
}

/**
 * nm_setting_get_name:
 * @setting: the #NMSetting
 *
 * Returns the type name of the #NMSetting object
 *
 * Returns: a string containing the type name of the #NMSetting object,
 * like 'ppp' or 'wireless' or 'wired'.
 **/
const char *
nm_setting_get_name (NMSetting *setting)
{
	NMSettingPrivate *priv;

	g_return_val_if_fail (NM_IS_SETTING (setting), NULL);
	priv = NM_SETTING_GET_PRIVATE (setting);
	_ensure_setting_info (setting, priv);
	return priv->info->name;
}

/**
 * nm_setting_verify:
 * @setting: the #NMSetting to verify
 * @all_settings: (element-type NMSetting): a #GSList of all settings
 *     in the connection from which @setting came
 * @error: location to store error, or %NULL
 *
 * Validates the setting.  Each setting's properties have allowed values, and
 * some are dependent on other values (hence the need for @all_settings).  The
 * returned #GError contains information about which property of the setting
 * failed validation, and in what way that property failed validation.
 *
 * Returns: %TRUE if the setting is valid, %FALSE if it is not
 **/
gboolean
nm_setting_verify (NMSetting *setting, GSList *all_settings, GError **error)
{
	NMSettingVerifyResult result = _nm_setting_verify (setting, all_settings, error);

	if (result == NM_SETTING_VERIFY_NORMALIZABLE)
		g_clear_error (error);

	return result == NM_SETTING_VERIFY_SUCCESS || result == NM_SETTING_VERIFY_NORMALIZABLE;
}

NMSettingVerifyResult
_nm_setting_verify (NMSetting *setting, GSList *all_settings, GError **error)
{
	g_return_val_if_fail (NM_IS_SETTING (setting), NM_SETTING_VERIFY_ERROR);
	g_return_val_if_fail (!error || *error == NULL, NM_SETTING_VERIFY_ERROR);

	if (NM_SETTING_GET_CLASS (setting)->verify)
		return NM_SETTING_GET_CLASS (setting)->verify (setting, all_settings, error);

	return NM_SETTING_VERIFY_SUCCESS;
}

static gboolean
compare_property (NMSetting *setting,
                  NMSetting *other,
                  const GParamSpec *prop_spec,
                  NMSettingCompareFlags flags)
{
	GValue value1 = G_VALUE_INIT;
	GValue value2 = G_VALUE_INIT;
	gboolean different;

	/* Handle compare flags */
	if (prop_spec->flags & NM_SETTING_PARAM_SECRET) {
		NMSettingSecretFlags a_secret_flags = NM_SETTING_SECRET_FLAG_NONE;
		NMSettingSecretFlags b_secret_flags = NM_SETTING_SECRET_FLAG_NONE;

		g_return_val_if_fail (!NM_IS_SETTING_VPN (setting), FALSE);

		if (!nm_setting_get_secret_flags (setting, prop_spec->name, &a_secret_flags, NULL))
			g_return_val_if_reached (FALSE);
		if (!nm_setting_get_secret_flags (other, prop_spec->name, &b_secret_flags, NULL))
			g_return_val_if_reached (FALSE);

		/* If the secret flags aren't the same the settings aren't the same */
		if (a_secret_flags != b_secret_flags)
			return FALSE;

		/* Check for various secret flags that might cause us to ignore comparing
		 * this property.
		 */
		if (   (flags & NM_SETTING_COMPARE_FLAG_IGNORE_AGENT_OWNED_SECRETS)
		    && (a_secret_flags & NM_SETTING_SECRET_FLAG_AGENT_OWNED))
			return TRUE;

		if (   (flags & NM_SETTING_COMPARE_FLAG_IGNORE_NOT_SAVED_SECRETS)
		    && (a_secret_flags & NM_SETTING_SECRET_FLAG_NOT_SAVED))
			return TRUE;
	}

	g_value_init (&value1, prop_spec->value_type);
	g_object_get_property (G_OBJECT (setting), prop_spec->name, &value1);

	g_value_init (&value2, prop_spec->value_type);
	g_object_get_property (G_OBJECT (other), prop_spec->name, &value2);

	different = g_param_values_cmp ((GParamSpec *) prop_spec, &value1, &value2);

	g_value_unset (&value1);
	g_value_unset (&value2);

	return different == 0 ? TRUE : FALSE;
}

/**
 * nm_setting_compare:
 * @a: a #NMSetting
 * @b: a second #NMSetting to compare with the first
 * @flags: compare flags, e.g. %NM_SETTING_COMPARE_FLAG_EXACT
 *
 * Compares two #NMSetting objects for similarity, with comparison behavior
 * modified by a set of flags.  See the documentation for #NMSettingCompareFlags
 * for a description of each flag's behavior.
 *
 * Returns: %TRUE if the comparison succeeds, %FALSE if it does not
 **/
gboolean
nm_setting_compare (NMSetting *a,
                    NMSetting *b,
                    NMSettingCompareFlags flags)
{
	GParamSpec **property_specs;
	guint n_property_specs;
	gint same = TRUE;
	guint i;

	g_return_val_if_fail (NM_IS_SETTING (a), FALSE);
	g_return_val_if_fail (NM_IS_SETTING (b), FALSE);

	/* First check that both have the same type */
	if (G_OBJECT_TYPE (a) != G_OBJECT_TYPE (b))
		return FALSE;

	/* And now all properties */
	property_specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (a), &n_property_specs);
	for (i = 0; i < n_property_specs && same; i++) {
		GParamSpec *prop_spec = property_specs[i];

		/* Fuzzy compare ignores secrets and properties defined with the FUZZY_IGNORE flag */
		if (   (flags & NM_SETTING_COMPARE_FLAG_FUZZY)
		    && (prop_spec->flags & (NM_SETTING_PARAM_FUZZY_IGNORE | NM_SETTING_PARAM_SECRET)))
			continue;

		if ((flags & NM_SETTING_COMPARE_FLAG_INFERRABLE) && !(prop_spec->flags & NM_SETTING_PARAM_INFERRABLE))
			continue;

		if (   (flags & NM_SETTING_COMPARE_FLAG_IGNORE_SECRETS)
		    && (prop_spec->flags & NM_SETTING_PARAM_SECRET))
			continue;

		same = NM_SETTING_GET_CLASS (a)->compare_property (a, b, prop_spec, flags);
	}
	g_free (property_specs);

	return same;
}

static inline gboolean
should_compare_prop (NMSetting *setting,
                     const char *prop_name,
                     NMSettingCompareFlags comp_flags,
                     GParamFlags prop_flags)
{
	/* Fuzzy compare ignores secrets and properties defined with the FUZZY_IGNORE flag */
	if (   (comp_flags & NM_SETTING_COMPARE_FLAG_FUZZY)
	    && (prop_flags & (NM_SETTING_PARAM_FUZZY_IGNORE | NM_SETTING_PARAM_SECRET)))
		return FALSE;

	if ((comp_flags & NM_SETTING_COMPARE_FLAG_INFERRABLE) && !(prop_flags & NM_SETTING_PARAM_INFERRABLE))
		return FALSE;

	if (prop_flags & NM_SETTING_PARAM_SECRET) {
		NMSettingSecretFlags secret_flags = NM_SETTING_SECRET_FLAG_NONE;

		if (comp_flags & NM_SETTING_COMPARE_FLAG_IGNORE_SECRETS)
			return FALSE;

		if (   NM_IS_SETTING_VPN (setting)
		    && g_strcmp0 (prop_name, NM_SETTING_VPN_SECRETS) == 0) {
			/* FIXME: NMSettingVPN:NM_SETTING_VPN_SECRETS has NM_SETTING_PARAM_SECRET.
			 * nm_setting_get_secret_flags() quite possibly fails, but it might succeed if the
			 * setting accidently uses a key "secrets". */
			return FALSE;
		}

		if (!nm_setting_get_secret_flags (setting, prop_name, &secret_flags, NULL))
			g_return_val_if_reached (FALSE);

		if (   (comp_flags & NM_SETTING_COMPARE_FLAG_IGNORE_AGENT_OWNED_SECRETS)
		    && (secret_flags & NM_SETTING_SECRET_FLAG_AGENT_OWNED))
			return FALSE;

		if (   (comp_flags & NM_SETTING_COMPARE_FLAG_IGNORE_NOT_SAVED_SECRETS)
		    && (secret_flags & NM_SETTING_SECRET_FLAG_NOT_SAVED))
			return FALSE;
	}

	if (   (comp_flags & NM_SETTING_COMPARE_FLAG_IGNORE_ID)
	    && NM_IS_SETTING_CONNECTION (setting)
	    && !strcmp (prop_name, NM_SETTING_CONNECTION_ID))
		return FALSE;

	return TRUE;
}

/**
 * nm_setting_diff:
 * @a: a #NMSetting
 * @b: a second #NMSetting to compare with the first
 * @flags: compare flags, e.g. %NM_SETTING_COMPARE_FLAG_EXACT
 * @invert_results: this parameter is used internally by libnm-util and should
 * be set to %FALSE.  If %TRUE inverts the meaning of the #NMSettingDiffResult.
 * @results: (inout) (transfer full) (element-type utf8 guint32): if the
 * settings differ, on return a hash table mapping the differing keys to one or
 * more %NMSettingDiffResult values OR-ed together.  If the settings do not
 * differ, any hash table passed in is unmodified.  If no hash table is passed
 * in and the settings differ, a new one is created and returned.
 *
 * Compares two #NMSetting objects for similarity, with comparison behavior
 * modified by a set of flags.  See the documentation for #NMSettingCompareFlags
 * for a description of each flag's behavior.  If the settings differ, the keys
 * of each setting that differ from the other are added to @results, mapped to
 * one or more #NMSettingDiffResult values.
 *
 * Returns: %TRUE if the settings contain the same values, %FALSE if they do not
 **/
gboolean
nm_setting_diff (NMSetting *a,
                 NMSetting *b,
                 NMSettingCompareFlags flags,
                 gboolean invert_results,
                 GHashTable **results)
{
	GParamSpec **property_specs;
	guint n_property_specs;
	guint i;
	NMSettingDiffResult a_result = NM_SETTING_DIFF_RESULT_IN_A;
	NMSettingDiffResult b_result = NM_SETTING_DIFF_RESULT_IN_B;
	NMSettingDiffResult a_result_default = NM_SETTING_DIFF_RESULT_IN_A_DEFAULT;
	NMSettingDiffResult b_result_default = NM_SETTING_DIFF_RESULT_IN_B_DEFAULT;
	gboolean results_created = FALSE;

	g_return_val_if_fail (results != NULL, FALSE);
	g_return_val_if_fail (NM_IS_SETTING (a), FALSE);
	if (b) {
		g_return_val_if_fail (NM_IS_SETTING (b), FALSE);
		g_return_val_if_fail (G_OBJECT_TYPE (a) == G_OBJECT_TYPE (b), FALSE);
	}

	if ((flags & (NM_SETTING_COMPARE_FLAG_DIFF_RESULT_WITH_DEFAULT | NM_SETTING_COMPARE_FLAG_DIFF_RESULT_NO_DEFAULT)) ==
	             (NM_SETTING_COMPARE_FLAG_DIFF_RESULT_WITH_DEFAULT | NM_SETTING_COMPARE_FLAG_DIFF_RESULT_NO_DEFAULT)) {
		/* conflicting flags: default to WITH_DEFAULT (clearing NO_DEFAULT). */
		flags &= ~NM_SETTING_COMPARE_FLAG_DIFF_RESULT_NO_DEFAULT;
	}

	/* If the caller is calling this function in a pattern like this to get
	 * complete diffs:
	 *
	 * nm_setting_diff (A, B, FALSE, &results);
	 * nm_setting_diff (B, A, TRUE, &results);
	 *
	 * and wants us to invert the results so that the second invocation comes
	 * out correctly, do that here.
	 */
	if (invert_results) {
		a_result = NM_SETTING_DIFF_RESULT_IN_B;
		b_result = NM_SETTING_DIFF_RESULT_IN_A;
		a_result_default = NM_SETTING_DIFF_RESULT_IN_B_DEFAULT;
		b_result_default = NM_SETTING_DIFF_RESULT_IN_A_DEFAULT;
	}

	if (*results == NULL) {
		*results = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
		results_created = TRUE;
	}

	/* And now all properties */
	property_specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (a), &n_property_specs);

	for (i = 0; i < n_property_specs; i++) {
		GParamSpec *prop_spec = property_specs[i];
		NMSettingDiffResult r = NM_SETTING_DIFF_RESULT_UNKNOWN;

		/* Handle compare flags */
		if (!should_compare_prop (a, prop_spec->name, flags, prop_spec->flags))
			continue;
		if (strcmp (prop_spec->name, NM_SETTING_NAME) == 0)
			continue;

		if (b) {
			gboolean different;

			different = !NM_SETTING_GET_CLASS (a)->compare_property (a, b, prop_spec, flags);
			if (different) {
				gboolean a_is_default, b_is_default;
				GValue value = G_VALUE_INIT;

				g_value_init (&value, prop_spec->value_type);
				g_object_get_property (G_OBJECT (a), prop_spec->name, &value);
				a_is_default = g_param_value_defaults (prop_spec, &value);

				g_value_reset (&value);
				g_object_get_property (G_OBJECT (b), prop_spec->name, &value);
				b_is_default = g_param_value_defaults (prop_spec, &value);

				g_value_unset (&value);
				if ((flags & NM_SETTING_COMPARE_FLAG_DIFF_RESULT_WITH_DEFAULT) == 0) {
					if (!a_is_default)
						r |= a_result;
					if (!b_is_default)
						r |= b_result;
				} else {
					r |= a_result | b_result;
					if (a_is_default)
						r |= a_result_default;
					if (b_is_default)
						r |= b_result_default;
				}
			}
		} else if ((flags & (NM_SETTING_COMPARE_FLAG_DIFF_RESULT_WITH_DEFAULT | NM_SETTING_COMPARE_FLAG_DIFF_RESULT_NO_DEFAULT)) == 0)
			r = a_result;  /* only in A */
		else {
			GValue value = G_VALUE_INIT;

			g_value_init (&value, prop_spec->value_type);
			g_object_get_property (G_OBJECT (a), prop_spec->name, &value);
			if (!g_param_value_defaults (prop_spec, &value))
				r |= a_result;
			else if (flags & NM_SETTING_COMPARE_FLAG_DIFF_RESULT_WITH_DEFAULT)
				r |= a_result | a_result_default;

			g_value_unset (&value);
		}

		if (r != NM_SETTING_DIFF_RESULT_UNKNOWN) {
			void *p;

			if (g_hash_table_lookup_extended (*results, prop_spec->name, NULL, &p)) {
				if ((r & GPOINTER_TO_UINT (p)) != r)
					g_hash_table_insert (*results, g_strdup (prop_spec->name), GUINT_TO_POINTER (r | GPOINTER_TO_UINT (p)));
			} else
				g_hash_table_insert (*results, g_strdup (prop_spec->name), GUINT_TO_POINTER (r));
		}
	}
	g_free (property_specs);

	/* Don't return an empty hash table */
	if (results_created && !g_hash_table_size (*results)) {
		g_hash_table_destroy (*results);
		*results = NULL;
	}

	return !(*results);
}

/**
 * nm_setting_enumerate_values:
 * @setting: the #NMSetting
 * @func: (scope call): user-supplied function called for each property of the setting
 * @user_data: user data passed to @func at each invocation
 *
 * Iterates over each property of the #NMSetting object, calling the supplied
 * user function for each property.
 **/
void
nm_setting_enumerate_values (NMSetting *setting,
                             NMSettingValueIterFn func,
                             gpointer user_data)
{
	GParamSpec **property_specs;
	guint n_property_specs;
	int i;

	g_return_if_fail (NM_IS_SETTING (setting));
	g_return_if_fail (func != NULL);

	property_specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (setting), &n_property_specs);
	for (i = 0; i < n_property_specs; i++) {
		GParamSpec *prop_spec = property_specs[i];
		GValue value = G_VALUE_INIT;

		g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (prop_spec));
		g_object_get_property (G_OBJECT (setting), prop_spec->name, &value);
		func (setting, prop_spec->name, &value, prop_spec->flags, user_data);
		g_value_unset (&value);
	}

	g_free (property_specs);
}

/**
 * nm_setting_clear_secrets:
 * @setting: the #NMSetting
 *
 * Resets and clears any secrets in the setting.  Secrets should be added to the
 * setting only when needed, and cleared immediately after use to prevent
 * leakage of information.
 **/
void
nm_setting_clear_secrets (NMSetting *setting)
{
	_nm_setting_clear_secrets (setting);
}

gboolean
_nm_setting_clear_secrets (NMSetting *setting)
{
	GParamSpec **property_specs;
	guint n_property_specs;
	guint i;
	gboolean changed = FALSE;

	g_return_val_if_fail (NM_IS_SETTING (setting), FALSE);

	property_specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (setting), &n_property_specs);

	for (i = 0; i < n_property_specs; i++) {
		GParamSpec *prop_spec = property_specs[i];

		if (prop_spec->flags & NM_SETTING_PARAM_SECRET) {
			GValue value = G_VALUE_INIT;

			g_value_init (&value, prop_spec->value_type);
			g_object_get_property (G_OBJECT (setting), prop_spec->name, &value);
			if (!g_param_value_defaults (prop_spec, &value)) {
				g_param_value_set_default (prop_spec, &value);
				g_object_set_property (G_OBJECT (setting), prop_spec->name, &value);
				changed = TRUE;
			}
			g_value_unset (&value);
		}
	}

	g_free (property_specs);

	return changed;
}

static gboolean
clear_secrets_with_flags (NMSetting *setting,
                          GParamSpec *pspec,
                          NMSettingClearSecretsWithFlagsFn func,
                          gpointer user_data)
{
	NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;
	gboolean changed = FALSE;

	g_return_val_if_fail (!NM_IS_SETTING_VPN (setting), FALSE);

	/* Clear the secret if the user function says to do so */
	if (!nm_setting_get_secret_flags (setting, pspec->name, &flags, NULL))
		g_return_val_if_reached (FALSE);

	if (func (setting, pspec->name, flags, user_data) == TRUE) {
		GValue value = G_VALUE_INIT;

		g_value_init (&value, pspec->value_type);
		g_object_get_property (G_OBJECT (setting), pspec->name, &value);
		if (!g_param_value_defaults (pspec, &value)) {
			g_param_value_set_default (pspec, &value);
			g_object_set_property (G_OBJECT (setting), pspec->name, &value);
			changed = TRUE;
		}
		g_value_unset (&value);
	}

	return changed;
}

/**
 * nm_setting_clear_secrets_with_flags:
 * @setting: the #NMSetting
 * @func: (scope call): function to be called to determine whether a
 *     specific secret should be cleared or not
 * @user_data: caller-supplied data passed to @func
 *
 * Clears and frees secrets determined by @func.
 **/
void
nm_setting_clear_secrets_with_flags (NMSetting *setting,
                                     NMSettingClearSecretsWithFlagsFn func,
                                     gpointer user_data)
{
	_nm_setting_clear_secrets_with_flags (setting, func, user_data);
}

gboolean
_nm_setting_clear_secrets_with_flags (NMSetting *setting,
                                      NMSettingClearSecretsWithFlagsFn func,
                                      gpointer user_data)
{
	GParamSpec **property_specs;
	guint n_property_specs;
	guint i;
	gboolean changed = FALSE;

	g_return_val_if_fail (setting, FALSE);
	g_return_val_if_fail (NM_IS_SETTING (setting), FALSE);
	g_return_val_if_fail (func != NULL, FALSE);

	property_specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (setting), &n_property_specs);
	for (i = 0; i < n_property_specs; i++) {
		if (property_specs[i]->flags & NM_SETTING_PARAM_SECRET) {
			changed |= NM_SETTING_GET_CLASS (setting)->clear_secrets_with_flags (setting,
			                                                                     property_specs[i],
			                                                                     func,
			                                                                     user_data);
		}
	}

	g_free (property_specs);
	return changed;
}

/**
 * nm_setting_need_secrets:
 * @setting: the #NMSetting
 *
 * Returns an array of property names for each secret which may be required
 * to make a successful connection.  The returned hints are only intended as a
 * guide to what secrets may be required, because in some circumstances, there
 * is no way to conclusively determine exactly which secrets are needed.
 *
 * Returns: (transfer container) (element-type utf8): a #GPtrArray containing
 * the property names of secrets of the #NMSetting which may be required; the
 * caller owns the array and must free it with g_ptr_array_free(), but must not
 * free the elements.
 **/
GPtrArray *
nm_setting_need_secrets (NMSetting *setting)
{
	GPtrArray *secrets = NULL;

	g_return_val_if_fail (NM_IS_SETTING (setting), NULL);

	if (NM_SETTING_GET_CLASS (setting)->need_secrets)
		secrets = NM_SETTING_GET_CLASS (setting)->need_secrets (setting);

	return secrets;
}

static int
update_one_secret (NMSetting *setting, const char *key, GValue *value, GError **error)
{
	GParamSpec *prop_spec;

	prop_spec = g_object_class_find_property (G_OBJECT_GET_CLASS (setting), key);
	if (!prop_spec) {
		g_set_error (error,
		             NM_SETTING_ERROR,
		             NM_SETTING_ERROR_PROPERTY_NOT_FOUND,
		             "%s", key);
		return NM_SETTING_UPDATE_SECRET_ERROR;
	}

	/* Silently ignore non-secrets */
	if (!(prop_spec->flags & NM_SETTING_PARAM_SECRET))
		return NM_SETTING_UPDATE_SECRET_SUCCESS_UNCHANGED;

	if (g_value_type_compatible (G_VALUE_TYPE (value), G_PARAM_SPEC_VALUE_TYPE (prop_spec))) {
		if (G_VALUE_HOLDS_STRING (value) && G_IS_PARAM_SPEC_STRING (prop_spec)) {
			/* String is expected to be a common case. Handle it specially and check whether
			 * the value is already set. Otherwise, we just reset the property and
			 * assume the value got modified. */
			char *v;

			g_object_get (G_OBJECT (setting), prop_spec->name, &v, NULL);
			if (g_strcmp0 (v, g_value_get_string (value)) == 0) {
				g_free (v);
				return NM_SETTING_UPDATE_SECRET_SUCCESS_UNCHANGED;
			}
			g_free (v);
		}
		g_object_set_property (G_OBJECT (setting), prop_spec->name, value);
		return NM_SETTING_UPDATE_SECRET_SUCCESS_MODIFIED;
	}
	g_set_error (error,
	             NM_SETTING_ERROR,
	             NM_SETTING_ERROR_PROPERTY_TYPE_MISMATCH,
	             "%s", key);
	return NM_SETTING_UPDATE_SECRET_ERROR;
}

/**
 * nm_setting_update_secrets:
 * @setting: the #NMSetting
 * @secrets: (element-type utf8 GObject.Value): a #GHashTable mapping
 * string to #GValue of setting property names and secrets
 * @error: location to store error, or %NULL
 *
 * Update the setting's secrets, given a hash table of secrets intended for that
 * setting (deserialized from D-Bus for example).
 *
 * Returns: %TRUE if the secrets were successfully updated, %FALSE on failure to
 * update one or more of the secrets.
 **/
gboolean
nm_setting_update_secrets (NMSetting *setting, GHashTable *secrets, GError **error)
{
	return _nm_setting_update_secrets (setting, secrets, error) != NM_SETTING_UPDATE_SECRET_ERROR;
}

NMSettingUpdateSecretResult
_nm_setting_update_secrets (NMSetting *setting, GHashTable *secrets, GError **error)
{
	GHashTableIter iter;
	gpointer key, data;
	GError *tmp_error = NULL;
	NMSettingUpdateSecretResult result = NM_SETTING_UPDATE_SECRET_SUCCESS_UNCHANGED;

	g_return_val_if_fail (NM_IS_SETTING (setting), NM_SETTING_UPDATE_SECRET_ERROR);
	g_return_val_if_fail (secrets != NULL, NM_SETTING_UPDATE_SECRET_ERROR);
	if (error)
		g_return_val_if_fail (*error == NULL, NM_SETTING_UPDATE_SECRET_ERROR);

	g_hash_table_iter_init (&iter, secrets);
	while (g_hash_table_iter_next (&iter, &key, &data)) {
		int success;
		const char *secret_key = (const char *) key;
		GValue *secret_value = (GValue *) data;

		success = NM_SETTING_GET_CLASS (setting)->update_one_secret (setting, secret_key, secret_value, &tmp_error);
		g_assert (!((success == NM_SETTING_UPDATE_SECRET_ERROR) ^ (!!tmp_error)));

		if (success == NM_SETTING_UPDATE_SECRET_ERROR) {
			g_propagate_error (error, tmp_error);
			return NM_SETTING_UPDATE_SECRET_ERROR;
		}

		if (success == NM_SETTING_UPDATE_SECRET_SUCCESS_MODIFIED)
			result = NM_SETTING_UPDATE_SECRET_SUCCESS_MODIFIED;
	}

	return result;
}

static gboolean
is_secret_prop (NMSetting *setting, const char *secret_name, GError **error)
{
	GParamSpec *pspec;

	pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (setting), secret_name);
	if (!pspec) {
		g_set_error (error,
		             NM_SETTING_ERROR,
		             NM_SETTING_ERROR_PROPERTY_NOT_FOUND,
		             "Secret %s not provided by this setting", secret_name);
		return FALSE;
	}

	if (!(pspec->flags & NM_SETTING_PARAM_SECRET)) {
		g_set_error (error,
		             NM_SETTING_ERROR,
		             NM_SETTING_ERROR_PROPERTY_NOT_SECRET,
		             "Property %s is not a secret", secret_name);
		return FALSE;
	}

	return TRUE;
}

static gboolean
get_secret_flags (NMSetting *setting,
                  const char *secret_name,
                  gboolean verify_secret,
                  NMSettingSecretFlags *out_flags,
                  GError **error)
{
	char *flags_prop;
	NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;

	if (verify_secret && !is_secret_prop (setting, secret_name, error)) {
		if (out_flags)
			*out_flags = NM_SETTING_SECRET_FLAG_NONE;
		return FALSE;
	}

	flags_prop = g_strdup_printf ("%s-flags", secret_name);
	g_object_get (G_OBJECT (setting), flags_prop, &flags, NULL);
	g_free (flags_prop);

	if (out_flags)
		*out_flags = flags;
	return TRUE;
}

/**
 * nm_setting_get_secret_flags:
 * @setting: the #NMSetting
 * @secret_name: the secret key name to get flags for
 * @out_flags: on success, the #NMSettingSecretFlags for the secret
 * @error: location to store error, or %NULL
 *
 * For a given secret, retrieves the #NMSettingSecretFlags describing how to
 * handle that secret.
 *
 * Returns: %TRUE on success (if the given secret name was a valid property of
 * this setting, and if that property is secret), %FALSE if not
 **/
gboolean
nm_setting_get_secret_flags (NMSetting *setting,
                             const char *secret_name,
                             NMSettingSecretFlags *out_flags,
                             GError **error)
{
	g_return_val_if_fail (NM_IS_SETTING (setting), FALSE);
	g_return_val_if_fail (secret_name != NULL, FALSE);

	return NM_SETTING_GET_CLASS (setting)->get_secret_flags (setting, secret_name, TRUE, out_flags, error);
}

static gboolean
set_secret_flags (NMSetting *setting,
                  const char *secret_name,
                  gboolean verify_secret,
                  NMSettingSecretFlags flags,
                  GError **error)
{
	char *flags_prop;

	if (verify_secret)
		g_return_val_if_fail (is_secret_prop (setting, secret_name, error), FALSE);

	flags_prop = g_strdup_printf ("%s-flags", secret_name);
	g_object_set (G_OBJECT (setting), flags_prop, flags, NULL);
	g_free (flags_prop);
	return TRUE;
}

/**
 * nm_setting_set_secret_flags:
 * @setting: the #NMSetting
 * @secret_name: the secret key name to set flags for
 * @flags: the #NMSettingSecretFlags for the secret
 * @error: location to store error, or %NULL
 *
 * For a given secret, stores the #NMSettingSecretFlags describing how to
 * handle that secret.
 *
 * Returns: %TRUE on success (if the given secret name was a valid property of
 * this setting, and if that property is secret), %FALSE if not
 **/
gboolean
nm_setting_set_secret_flags (NMSetting *setting,
                             const char *secret_name,
                             NMSettingSecretFlags flags,
                             GError **error)
{
	g_return_val_if_fail (NM_IS_SETTING (setting), FALSE);
	g_return_val_if_fail (secret_name != NULL, FALSE);
	g_return_val_if_fail (flags <= NM_SETTING_SECRET_FLAGS_ALL, FALSE);

	return NM_SETTING_GET_CLASS (setting)->set_secret_flags (setting, secret_name, TRUE, flags, error);
}

/**
 * nm_setting_to_string:
 * @setting: the #NMSetting
 *
 * Convert the setting into a string.  For debugging purposes ONLY, should NOT
 * be used for serialization of the setting, or machine-parsed in any way. The
 * output format is not guaranteed to be stable and may change at any time.
 *
 * Returns: an allocated string containing a textual representation of the
 * setting's properties and values (including secrets!), which the caller should
 * free with g_free()
 **/
char *
nm_setting_to_string (NMSetting *setting)
{
	GString *string;
	GParamSpec **property_specs;
	guint n_property_specs;
	guint i;

	g_return_val_if_fail (NM_IS_SETTING (setting), NULL);

	property_specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (setting), &n_property_specs);

	string = g_string_new (nm_setting_get_name (setting));
	g_string_append_c (string, '\n');

	for (i = 0; i < n_property_specs; i++) {
		GParamSpec *prop_spec = property_specs[i];
		GValue value = G_VALUE_INIT;
		char *value_str;
		gboolean is_default;

		if (strcmp (prop_spec->name, NM_SETTING_NAME) == 0)
			continue;

		g_value_init (&value, prop_spec->value_type);
		g_object_get_property (G_OBJECT (setting), prop_spec->name, &value);

		value_str = g_strdup_value_contents (&value);
		g_string_append_printf (string, "\t%s : %s", prop_spec->name, value_str);
		g_free (value_str);

		is_default = g_param_value_defaults (prop_spec, &value);
		g_value_unset (&value);

		g_string_append (string, " (");
		g_string_append_c (string, 's');
		if (is_default)
			g_string_append_c (string, 'd');
		g_string_append_c (string, ')');
		g_string_append_c (string, '\n');
	}

	g_free (property_specs);
	g_string_append_c (string, '\n');

	return g_string_free (string, FALSE);
}

/**
 * nm_setting_get_virtual_iface_name:
 * @setting: the #NMSetting
 *
 * Returns the name of the virtual kernel interface which the connection
 * needs to use if specified in the settings.
 *
 * Returns: Name of the virtual interface or %NULL if the setting does not
 * support this feature
 **/
const char *
nm_setting_get_virtual_iface_name (NMSetting *setting)
{
	g_return_val_if_fail (NM_IS_SETTING (setting), NULL);

	if (NM_SETTING_GET_CLASS (setting)->get_virtual_iface_name)
		return NM_SETTING_GET_CLASS (setting)->get_virtual_iface_name (setting);

	return NULL;
}


NMSettingVerifyResult
_nm_setting_verify_deprecated_virtual_iface_name (const char *interface_name,
                                                  gboolean allow_missing,
                                                  const char *setting_name,
                                                  const char *setting_property,
                                                  GQuark error_quark,
                                                  gint e_invalid_property,
                                                  gint e_missing_property,
                                                  GSList *all_settings,
                                                  GError **error)
{
	NMSettingConnection *s_con;
	const char *con_name;

	s_con = NM_SETTING_CONNECTION (nm_setting_find_in_list (all_settings, NM_SETTING_CONNECTION_SETTING_NAME));
	con_name = s_con ? nm_setting_connection_get_interface_name (s_con) : NULL;
	if (!interface_name && !con_name) {
		if (allow_missing)
			return NM_SETTING_VERIFY_SUCCESS;

		g_set_error_literal (error,
		                     NM_SETTING_CONNECTION_ERROR,
		                     NM_SETTING_CONNECTION_ERROR_MISSING_PROPERTY,
		                     _("property is missing"));
		g_prefix_error (error, "%s.%s: ", NM_SETTING_CONNECTION_SETTING_NAME, NM_SETTING_CONNECTION_INTERFACE_NAME);
		return NM_SETTING_VERIFY_ERROR;
	}
	if (!con_name && !nm_utils_iface_valid_name (interface_name)) {
		/* the interface_name is invalid, we cannot normalize it. Only do this if !con_name,
		 * because if con_name is set, it can overwrite interface_name. */
		g_set_error_literal (error,
		                     error_quark,
		                     e_invalid_property,
		                     _("property is invalid"));
		g_prefix_error (error, "%s.%s: ", setting_name, setting_property);
		return NM_SETTING_VERIFY_ERROR;
	}
	if (!con_name) {
		/* NMSettingConnection has interface not set, it should be normalized to interface_name */
		g_set_error_literal (error,
		                     NM_SETTING_CONNECTION_ERROR,
		                     NM_SETTING_CONNECTION_ERROR_MISSING_PROPERTY,
		                     _("property is missing"));
		g_prefix_error (error, "%s.%s: ", NM_SETTING_CONNECTION_SETTING_NAME, NM_SETTING_CONNECTION_INTERFACE_NAME);
		return NM_SETTING_VERIFY_NORMALIZABLE;
	}
	if (!nm_utils_iface_valid_name (con_name)) {
		/* NMSettingConnection:interface_name is invalid, we cannot normalize it. */
		g_set_error_literal (error,
		                     NM_SETTING_CONNECTION_ERROR,
		                     NM_SETTING_CONNECTION_ERROR_INVALID_PROPERTY,
		                     _("property is invalid"));
		g_prefix_error (error, "%s.%s: ", NM_SETTING_CONNECTION_SETTING_NAME, NM_SETTING_CONNECTION_INTERFACE_NAME);
		return NM_SETTING_VERIFY_ERROR;
	}
	if (!interface_name) {
		/* Normalize by setting NMSettingConnection:interface_name. */
		g_set_error_literal (error,
		                     error_quark,
		                     e_missing_property,
		                     _("property is missing"));
		g_prefix_error (error, "%s.%s: ", setting_name, setting_property);
		return NM_SETTING_VERIFY_NORMALIZABLE;
	}
	if (strcmp (con_name, interface_name) != 0) {
		/* con_name and interface_name are different. It can be normalized by setting interface_name
		 * to con_name. */
		g_set_error_literal (error,
		                     error_quark,
		                     e_invalid_property,
		                     _("property is invalid"));
		g_prefix_error (error, "%s.%s: ", setting_name, setting_property);
		/* we would like to make this a NORMALIZEABLE_ERROR, but that might
		 * break older connections. */
		return NM_SETTING_VERIFY_NORMALIZABLE;
	}

	return NM_SETTING_VERIFY_SUCCESS;
}

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

static void
nm_setting_init (NMSetting *setting)
{
}

static GObject*
constructor (GType type,
             guint n_construct_params,
             GObjectConstructParam *construct_params)
{
	GObject *object;

	object = G_OBJECT_CLASS (nm_setting_parent_class)->constructor (type,
	                                                                n_construct_params,
	                                                                construct_params);

	_ensure_setting_info (object, NM_SETTING_GET_PRIVATE (object));
	return object;
}

static void
set_property (GObject *object, guint prop_id,
              const GValue *value, GParamSpec *pspec)
{
	NMSettingPrivate *priv = NM_SETTING_GET_PRIVATE (object);

	switch (prop_id) {
	case PROP_NAME:
		/* The setter for NAME is deprecated and should not be used anymore.
		 * Keep the setter for NAME to remain backward compatible.
		 * Only assert that the caller does not try to set the name to a different value
		 * then the registered name, which would be extra wrong.
		 **/
		_ensure_setting_info (object, priv);
		g_return_if_fail (!g_strcmp0 (priv->info->name, g_value_get_string (value)));
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void
get_property (GObject *object, guint prop_id,
              GValue *value, GParamSpec *pspec)
{
	NMSetting *setting = NM_SETTING (object);

	switch (prop_id) {
	case PROP_NAME:
		g_value_set_string (value, nm_setting_get_name (setting));
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void
nm_setting_class_init (NMSettingClass *setting_class)
{
	GObjectClass *object_class = G_OBJECT_CLASS (setting_class);

	g_type_class_add_private (setting_class, sizeof (NMSettingPrivate));

	/* virtual methods */
	object_class->constructor  = constructor;
	object_class->set_property = set_property;
	object_class->get_property = get_property;

	setting_class->update_one_secret = update_one_secret;
	setting_class->get_secret_flags = get_secret_flags;
	setting_class->set_secret_flags = set_secret_flags;
	setting_class->compare_property = compare_property;
	setting_class->clear_secrets_with_flags = clear_secrets_with_flags;

	/* Properties */

	/**
	 * NMSetting:name:
	 *
	 * The setting's name, which uniquely identifies the setting within the
	 * connection.  Each setting type has a name unique to that type, for
	 * example "ppp" or "wireless" or "wired".
	 **/
	g_object_class_install_property
		(object_class, PROP_NAME,
		 g_param_spec_string (NM_SETTING_NAME, "", "",
		                      NULL,
		                      G_PARAM_READWRITE |
		                      G_PARAM_STATIC_STRINGS));
}