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NetworkManager/libnm-core/nm-setting-user.c

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2017 Red Hat, Inc.
*/
#include "libnm-core/nm-default-libnm-core.h"
#include "nm-setting-user.h"
#include "nm-setting.h"
#include "nm-setting-private.h"
#include "nm-utils-private.h"
/**
* SECTION:nm-setting-user
* @short_description: Describes user properties
*
* The #NMSettingUser object is a #NMSetting subclass that allow to attach
* arbitrary user data to #NMConnection objects.
**/
#define MAX_NUM_KEYS 256
/*****************************************************************************/
NM_GOBJECT_PROPERTIES_DEFINE(NMSettingUser, PROP_DATA, );
typedef struct {
GHashTable * data;
GHashTable * data_invalid;
const char **keys;
} NMSettingUserPrivate;
/**
* NMSettingUser:
*
* General User Profile Settings
*/
struct _NMSettingUser {
NMSetting parent;
NMSettingUserPrivate _priv;
};
struct _NMSettingUserClass {
NMSettingClass parent;
};
G_DEFINE_TYPE(NMSettingUser, nm_setting_user, NM_TYPE_SETTING)
#define NM_SETTING_USER_GET_PRIVATE(self) _NM_GET_PRIVATE(self, NMSettingUser, NM_IS_SETTING_USER)
/*****************************************************************************/
static gboolean
_key_char_is_regular(char ch)
{
/* allow words of printable characters, plus some
* special characters, for example to support base64 encoding. */
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9')
|| NM_IN_SET(ch, '-', '_', '+', '/', '=');
}
/**
* nm_setting_user_check_key:
* @key: the key to check
* @error: a #GError, %NULL to ignore.
*
* Checks whether @key is a valid user data key. This means,
* key is not %NULL, not too large and valid ASCII. Also,
* only digits and numbers are allowed with a few special
* characters. The key must contain at least one '.' and
* look like a fully qualified DNS name.
*
* Since: 1.8
*
* Returns: %TRUE if @key is a valid user data key.
*/
gboolean
nm_setting_user_check_key(const char *key, GError **error)
{
gsize len;
gboolean has_dot;
char ch;
g_return_val_if_fail(!error || !*error, FALSE);
if (!key || !key[0]) {
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("missing key"));
return FALSE;
}
len = strlen(key);
if (len > 255) {
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("key is too long"));
return FALSE;
}
if (!g_utf8_validate(key, len, NULL)) {
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("key must be UTF8"));
return FALSE;
}
has_dot = FALSE;
while (TRUE) {
ch = (key++)[0];
/* Allow something that looks like a FQN, separating namespaces by a single '.'
* We want to print the keys nicely in nmcli requiring escaping.
*
* If a user really has to encode special values in the name, he may base64 encode it. */
if (!_key_char_is_regular(ch))
break;
while (_key_char_is_regular(key[0]))
key++;
ch = key[0];
if (ch == '\0') {
if (!has_dot) {
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("key requires a '.' for a namespace"));
return FALSE;
}
return TRUE;
}
if (ch != '.')
break;
has_dot = TRUE;
ch = (++key)[0];
if (ch == '.') {
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("key cannot contain \"..\""));
return FALSE;
}
}
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("key contains invalid characters"));
return FALSE;
}
/**
* nm_setting_user_check_val:
* @val: the value to check
* @error: a #GError, %NULL to ignore.
*
* Checks whether @val is a valid user data value. This means,
* value is not %NULL, not too large and valid UTF-8.
*
* Since: 1.8
*
* Returns: %TRUE if @val is a valid user data value.
*/
gboolean
nm_setting_user_check_val(const char *val, GError **error)
{
gsize len;
g_return_val_if_fail(!error || !*error, FALSE);
if (!val) {
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("value is missing"));
return FALSE;
}
len = strlen(val);
if (len > 8 * 1024) {
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("value is too large"));
return FALSE;
}
if (!g_utf8_validate(val, len, NULL)) {
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("value is not valid UTF8"));
return FALSE;
}
return TRUE;
}
/*****************************************************************************/
static GHashTable *
_create_data_hash(void)
{
return g_hash_table_new_full(nm_str_hash, g_str_equal, g_free, g_free);
}
/**
* nm_setting_user_get_keys:
* @setting: the #NMSettingUser
* @out_len: (out): the length of the returned array
*
* Returns: (array length=out_len) (transfer none): a
* %NULL-terminated array containing each key from the table.
**/
const char *const *
nm_setting_user_get_keys(NMSettingUser *setting, guint *out_len)
{
NMSettingUser * self = setting;
NMSettingUserPrivate *priv;
g_return_val_if_fail(NM_IS_SETTING_USER(self), NULL);
priv = NM_SETTING_USER_GET_PRIVATE(self);
if (priv->keys) {
NM_SET_OUT(out_len, g_hash_table_size(priv->data));
return priv->keys;
}
priv->keys = nm_utils_strdict_get_keys(priv->data, TRUE, out_len);
/* don't return %NULL, but hijack the @keys fields as a pseudo
* empty strv array. */
return priv->keys ?: ((const char **) &priv->keys);
}
/*****************************************************************************/
/**
* nm_setting_user_get_data:
* @setting: the #NMSettingUser instance
* @key: the key to lookup
*
* Since: 1.8
*
* Returns: (transfer none): the value associated with @key or %NULL if no such
* value exists.
*/
const char *
nm_setting_user_get_data(NMSettingUser *setting, const char *key)
{
NMSettingUser * self = setting;
NMSettingUserPrivate *priv;
g_return_val_if_fail(NM_IS_SETTING_USER(self), NULL);
g_return_val_if_fail(key, NULL);
priv = NM_SETTING_USER_GET_PRIVATE(self);
if (!priv->data)
return NULL;
return g_hash_table_lookup(priv->data, key);
}
/**
* nm_setting_user_set_data:
* @setting: the #NMSettingUser instance
* @key: the key to set
* @val: (allow-none): the value to set or %NULL to clear a key.
* @error: (allow-none): optional error argument
*
* Since: 1.8
*
* Returns: %TRUE if the operation was successful. The operation
* can fail if @key or @val are not valid strings according
* to nm_setting_user_check_key() and nm_setting_user_check_val().
*/
gboolean
nm_setting_user_set_data(NMSettingUser *setting, const char *key, const char *val, GError **error)
{
NMSettingUser * self = setting;
NMSettingUserPrivate *priv;
gboolean changed = FALSE;
g_return_val_if_fail(NM_IS_SETTING_USER(self), FALSE);
g_return_val_if_fail(!error || !*error, FALSE);
if (!nm_setting_user_check_key(key, error))
return FALSE;
if (val && !nm_setting_user_check_val(val, error))
return FALSE;
priv = NM_SETTING_USER_GET_PRIVATE(self);
if (!val) {
if (priv->data && g_hash_table_remove(priv->data, key)) {
nm_clear_g_free(&priv->keys);
changed = TRUE;
}
goto out;
}
if (priv->data) {
const char *key2, *val2;
if (g_hash_table_lookup_extended(priv->data, key, (gpointer *) &key2, (gpointer *) &val2)) {
if (nm_streq(val, val2))
goto out;
} else {
if (g_hash_table_size(priv->data) >= MAX_NUM_KEYS) {
/* limit the number of valid keys */
g_set_error_literal(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("maximum number of user data entries reached"));
return FALSE;
}
nm_clear_g_free(&priv->keys);
}
} else
priv->data = _create_data_hash();
g_hash_table_insert(priv->data, g_strdup(key), g_strdup(val));
changed = TRUE;
out:
if (priv->data_invalid) {
/* setting a value purges all invalid values that were set
* via GObject property. */
changed = TRUE;
nm_clear_pointer(&priv->data_invalid, g_hash_table_unref);
}
if (changed)
_notify(self, PROP_DATA);
return TRUE;
}
/*****************************************************************************/
static gboolean
verify(NMSetting *setting, NMConnection *connection, GError **error)
{
NMSettingUser * self = NM_SETTING_USER(setting);
NMSettingUserPrivate *priv = NM_SETTING_USER_GET_PRIVATE(self);
if (priv->data_invalid) {
const char * key, *val;
GHashTableIter iter;
gs_free_error GError *local = NULL;
g_hash_table_iter_init(&iter, priv->data_invalid);
while (g_hash_table_iter_next(&iter, (gpointer *) &key, (gpointer *) &val)) {
if (!nm_setting_user_check_key(key, &local)) {
g_set_error(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_FAILED,
_("invalid key \"%s\": %s"),
key,
local->message);
} else if (!nm_setting_user_check_val(val, &local)) {
g_set_error(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_FAILED,
_("invalid value for \"%s\": %s"),
key,
local->message);
} else {
nm_assert_not_reached();
continue;
}
g_prefix_error(error, "%s.%s: ", NM_SETTING_USER_SETTING_NAME, NM_SETTING_USER_DATA);
return FALSE;
}
nm_assert_not_reached();
}
if (priv->data && g_hash_table_size(priv->data) > MAX_NUM_KEYS) {
g_set_error(error,
NM_CONNECTION_ERROR,
NM_CONNECTION_ERROR_INVALID_PROPERTY,
_("maximum number of user data entries reached (%u instead of %u)"),
g_hash_table_size(priv->data),
(unsigned) MAX_NUM_KEYS);
g_prefix_error(error, "%s.%s: ", NM_SETTING_USER_SETTING_NAME, NM_SETTING_USER_DATA);
return FALSE;
}
return TRUE;
}
static NMTernary
compare_property(const NMSettInfoSetting *sett_info,
guint property_idx,
NMConnection * con_a,
NMSetting * set_a,
NMConnection * con_b,
NMSetting * set_b,
NMSettingCompareFlags flags)
{
NMSettingUserPrivate *priv, *pri2;
if (nm_streq(sett_info->property_infos[property_idx].name, NM_SETTING_USER_DATA)) {
if (NM_FLAGS_HAS(flags, NM_SETTING_COMPARE_FLAG_INFERRABLE))
return NM_TERNARY_DEFAULT;
if (!set_b)
return TRUE;
priv = NM_SETTING_USER_GET_PRIVATE(NM_SETTING_USER(set_a));
pri2 = NM_SETTING_USER_GET_PRIVATE(NM_SETTING_USER(set_b));
return nm_utils_hashtable_equal(priv->data, pri2->data, TRUE, g_str_equal)
&& nm_utils_hashtable_equal(priv->data_invalid,
pri2->data_invalid,
TRUE,
g_str_equal);
}
return NM_SETTING_CLASS(nm_setting_user_parent_class)
->compare_property(sett_info, property_idx, con_a, set_a, con_b, set_b, flags);
}
/*****************************************************************************/
static void
get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
NMSettingUser * self = NM_SETTING_USER(object);
NMSettingUserPrivate *priv = NM_SETTING_USER_GET_PRIVATE(self);
GHashTableIter iter;
GHashTable * data;
const char * key, *val;
switch (prop_id) {
case PROP_DATA:
data = _create_data_hash();
if (priv->data) {
g_hash_table_iter_init(&iter, priv->data);
while (g_hash_table_iter_next(&iter, (gpointer *) &key, (gpointer *) &val))
g_hash_table_insert(data, g_strdup(key), g_strdup(val));
}
if (priv->data_invalid) {
g_hash_table_iter_init(&iter, priv->data_invalid);
while (g_hash_table_iter_next(&iter, (gpointer *) &key, (gpointer *) &val))
g_hash_table_insert(data, g_strdup(key), g_strdup(val));
}
g_value_take_boxed(value, data);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
break;
}
}
static void
set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
NMSettingUser * self = NM_SETTING_USER(object);
NMSettingUserPrivate *priv = NM_SETTING_USER_GET_PRIVATE(self);
GHashTableIter iter;
GHashTable * data;
const char * key, *val;
switch (prop_id) {
case PROP_DATA:
nm_clear_g_free(&priv->keys);
data = g_value_get_boxed(value);
if (!data || !g_hash_table_size(data)) {
nm_clear_pointer(&priv->data, g_hash_table_unref);
nm_clear_pointer(&priv->data_invalid, g_hash_table_unref);
return;
}
if (priv->data)
g_hash_table_remove_all(priv->data);
else
priv->data = _create_data_hash();
if (priv->data_invalid)
g_hash_table_remove_all(priv->data_invalid);
g_hash_table_iter_init(&iter, data);
while (g_hash_table_iter_next(&iter, (gpointer *) &key, (gpointer *) &val)) {
if (nm_setting_user_check_key(key, NULL) && nm_setting_user_check_val(val, NULL))
g_hash_table_insert(priv->data, g_strdup(key), g_strdup(val));
else {
if (!priv->data_invalid)
priv->data_invalid = _create_data_hash();
g_hash_table_insert(priv->data_invalid, g_strdup(key), g_strdup(val));
}
}
if (priv->data_invalid && !g_hash_table_size(priv->data_invalid))
nm_clear_pointer(&priv->data_invalid, g_hash_table_unref);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
break;
}
}
/*****************************************************************************/
static void
nm_setting_user_init(NMSettingUser *self)
{}
/**
* nm_setting_user_new:
*
* Creates a new #NMSettingUser object with default values.
*
* Returns: the new empty #NMSettingUser object
**/
NMSetting *
nm_setting_user_new(void)
{
return g_object_new(NM_TYPE_SETTING_USER, NULL);
}
static void
finalize(GObject *object)
{
NMSettingUser * self = NM_SETTING_USER(object);
NMSettingUserPrivate *priv = NM_SETTING_USER_GET_PRIVATE(self);
g_free(priv->keys);
if (priv->data)
g_hash_table_unref(priv->data);
if (priv->data_invalid)
g_hash_table_unref(priv->data_invalid);
G_OBJECT_CLASS(nm_setting_user_parent_class)->finalize(object);
}
static void
nm_setting_user_class_init(NMSettingUserClass *klass)
{
GObjectClass * object_class = G_OBJECT_CLASS(klass);
NMSettingClass *setting_class = NM_SETTING_CLASS(klass);
GArray * properties_override = _nm_sett_info_property_override_create_array();
object_class->get_property = get_property;
object_class->set_property = set_property;
object_class->finalize = finalize;
setting_class->compare_property = compare_property;
setting_class->verify = verify;
/**
* NMSettingUser:data: (type GHashTable(utf8,utf8))
*
* A dictionary of key/value pairs with user data. This data is ignored by NetworkManager
* and can be used at the users discretion. The keys only support a strict ascii format,
* but the values can be arbitrary UTF8 strings up to a certain length.
*
* Since: 1.8
**/
/* ---ifcfg-rh---
* property: data
* variable: NM_USER_*
* description: each key/value pair is stored as a separate variable with
* name composed by concatenating NM_USER_ with the encoded key. The key is
* encoded by substituting lowercase letters with uppercase and prepending
* uppercase letters with an underscore. A dot is encoded as a double
* underscore. Remaining characters are encoded as underscore followed by a
* 3 digit octal representation of the character.
* example: NM_USER_FOO__BAR=something
* ---end---
*/
obj_properties[PROP_DATA] = g_param_spec_boxed(NM_SETTING_USER_DATA,
"",
"",
G_TYPE_HASH_TABLE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
_nm_properties_override_gobj(properties_override,
obj_properties[PROP_DATA],
&nm_sett_info_propert_type_strdict);
g_object_class_install_properties(object_class, _PROPERTY_ENUMS_LAST, obj_properties);
_nm_setting_class_commit_full(setting_class,
NM_META_SETTING_TYPE_USER,
NULL,
properties_override);
}
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