libeos-parental-controls: Initial implementation of library
This allows the app filter to be queried, and includes all the basic parts of a shared library. Introspection and unit tests are to follow. Signed-off-by: Philip Withnall <withnall@endlessm.com> https://phabricator.endlessm.com/T23859
This commit is contained in:
Philip Withnall
parent
908f77b895
commit
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
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*
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* Copyright © 2018 Endless Mobile, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors:
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* - Philip Withnall <withnall@endlessm.com>
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*/
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#include "config.h"
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#include <glib.h>
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#include <glib-object.h>
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#include <glib/gi18n-lib.h>
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#include <gio/gio.h>
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#include <libeos-parental-controls/app-filter.h>
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G_DEFINE_QUARK (EpcAppFilterError, epc_app_filter_error)
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/**
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* EpcAppFilterListType:
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* @EPC_APP_FILTER_LIST_BLACKLIST: Any program in the list is not allowed to
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* be run.
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* @EPC_APP_FILTER_LIST_WHITELIST: Any program not in the list is not allowed
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* to be run.
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*
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* Different semantics for interpreting an application list.
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*
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* Since: 0.1.0
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*/
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typedef enum
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{
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EPC_APP_FILTER_LIST_BLACKLIST,
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EPC_APP_FILTER_LIST_WHITELIST,
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} EpcAppFilterListType;
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struct _EpcAppFilter
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{
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gint ref_count;
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uid_t user_id;
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gchar **app_list; /* (owned) (array zero-terminated=1) */
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EpcAppFilterListType app_list_type;
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};
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G_DEFINE_BOXED_TYPE (EpcAppFilter, epc_app_filter,
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epc_app_filter_ref, epc_app_filter_unref)
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/**
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* epc_app_filter_ref:
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* @filter: (transfer none): an #EpcAppFilter
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*
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* Increment the reference count of @filter, and return the same pointer to it.
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*
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* Returns: (transfer full): the same pointer as @filter
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* Since: 0.1.0
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*/
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EpcAppFilter *
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epc_app_filter_ref (EpcAppFilter *filter)
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{
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g_return_val_if_fail (filter != NULL, NULL);
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g_return_val_if_fail (filter->ref_count >= 1, NULL);
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g_return_val_if_fail (filter->ref_count <= G_MAXINT - 1, NULL);
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filter->ref_count++;
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return filter;
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}
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/**
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* epc_app_filter_unref:
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* @filter: (transfer full): an #EpcAppFilter
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*
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* Decrement the reference count of @filter. If the reference count reaches
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* zero, free the @filter and all its resources.
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*
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* Since: 0.1.0
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*/
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void
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epc_app_filter_unref (EpcAppFilter *filter)
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{
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g_return_if_fail (filter != NULL);
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g_return_if_fail (filter->ref_count >= 1);
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filter->ref_count--;
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if (filter->ref_count <= 0)
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{
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g_strfreev (filter->app_list);
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g_free (filter);
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}
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}
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/**
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* epc_app_filter_get_user_id:
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* @filter: an #EpcAppFilter
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*
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* Get the user ID of the user this #EpcAppFilter is for.
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*
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* Returns: user ID of the relevant user
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* Since: 0.1.0
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*/
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uid_t
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epc_app_filter_get_user_id (EpcAppFilter *filter)
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{
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g_return_val_if_fail (filter != NULL, FALSE);
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g_return_val_if_fail (filter->ref_count >= 1, FALSE);
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return filter->user_id;
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}
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/**
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* epc_app_filter_is_path_allowed:
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* @filter: an #EpcAppFilter
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* @path: absolute path of a program to check
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*
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* Check whether the program at @path is allowed to be run according to this
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* app filter. @path will be canonicalised without doing any I/O.
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*
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* Returns: %TRUE if the user this @filter corresponds to is allowed to run the
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* program at @path according to the @filter policy; %FALSE otherwise
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* Since: 0.1.0
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*/
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gboolean
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epc_app_filter_is_path_allowed (EpcAppFilter *filter,
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const gchar *path)
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{
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g_return_val_if_fail (filter != NULL, FALSE);
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g_return_val_if_fail (filter->ref_count >= 1, FALSE);
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g_return_val_if_fail (path != NULL, FALSE);
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g_return_val_if_fail (g_path_is_absolute (path), FALSE);
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g_autofree gchar *canonical_path = g_canonicalize_filename (path, "/");
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gboolean path_in_list = g_strv_contains ((const gchar * const *) filter->app_list,
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canonical_path);
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switch (filter->app_list_type)
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{
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case EPC_APP_FILTER_LIST_BLACKLIST:
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return !path_in_list;
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case EPC_APP_FILTER_LIST_WHITELIST:
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return path_in_list;
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default:
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g_assert_not_reached ();
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}
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}
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/* Check if @error is a D-Bus remote error mataching @expected_error_name. */
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static gboolean
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bus_remote_error_matches (const GError *error,
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const gchar *expected_error_name)
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{
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g_autofree gchar *error_name = NULL;
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if (!g_dbus_error_is_remote_error (error))
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return FALSE;
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error_name = g_dbus_error_get_remote_error (error);
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return g_str_equal (error_name, expected_error_name);
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}
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/* Convert a #GDBusError into a #EpcAppFilter error. */
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static GError *
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bus_error_to_app_filter_error (const GError *bus_error,
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uid_t user_id)
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{
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if (g_error_matches (bus_error, G_DBUS_ERROR, G_DBUS_ERROR_ACCESS_DENIED) ||
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bus_remote_error_matches (bus_error, "org.freedesktop.Accounts.Error.PermissionDenied"))
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return g_error_new (EPC_APP_FILTER_ERROR, EPC_APP_FILTER_ERROR_PERMISSION_DENIED,
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_("Not allowed to query app filter data for user %u"),
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user_id);
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else if (g_error_matches (bus_error, G_DBUS_ERROR, G_DBUS_ERROR_UNKNOWN_METHOD))
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return g_error_new (EPC_APP_FILTER_ERROR, EPC_APP_FILTER_ERROR_INVALID_USER,
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_("User %u does not exist"), user_id);
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else
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return g_error_copy (bus_error);
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}
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static void get_bus_cb (GObject *obj,
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GAsyncResult *result,
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gpointer user_data);
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static void get_app_filter (GDBusConnection *connection,
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GTask *task);
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static void get_app_filter_cb (GObject *obj,
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GAsyncResult *result,
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gpointer user_data);
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typedef struct
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{
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uid_t user_id;
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gboolean allow_interactive_authorization;
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} GetAppFilterData;
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static void
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get_app_filter_data_free (GetAppFilterData *data)
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{
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g_free (data);
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}
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G_DEFINE_AUTOPTR_CLEANUP_FUNC (GetAppFilterData, get_app_filter_data_free)
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/**
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* epc_get_app_filter_async:
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* @connection: (nullable): a #GDBusConnection to the system bus, or %NULL to
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* use the default
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* @user_id: ID of the user to query, typically coming from getuid()
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* @allow_interactive_authorization: %TRUE to allow interactive polkit
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* authorization dialogues to be displayed during the call; %FALSE otherwise
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* @callback: a #GAsyncReadyCallback
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @user_data: user data to pass to @callback
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*
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* Asynchronously get a snapshot of the app filter settings for the given
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* @user_id.
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*
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* @connection should be a connection to the system bus, where accounts-service
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* runs. It’s provided mostly for testing purposes, or to allow an existing
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* connection to be re-used. Pass %NULL to use the default connection.
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*
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* On failure, an #EpcAppFilterError, a #GDBusError or a #GIOError will be
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* returned.
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*
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* Since: 0.1.0
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*/
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void
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epc_get_app_filter_async (GDBusConnection *connection,
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uid_t user_id,
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gboolean allow_interactive_authorization,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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g_autoptr(GDBusConnection) connection_owned = NULL;
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g_autoptr(GTask) task = NULL;
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g_autoptr(GetAppFilterData) data = NULL;
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g_return_if_fail (connection == NULL || G_IS_DBUS_CONNECTION (connection));
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g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
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task = g_task_new (NULL, cancellable, callback, user_data);
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g_task_set_source_tag (task, epc_get_app_filter_async);
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data = g_new0 (GetAppFilterData, 1);
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data->user_id = user_id;
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data->allow_interactive_authorization = allow_interactive_authorization;
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g_task_set_task_data (task, g_steal_pointer (&data),
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(GDestroyNotify) get_app_filter_data_free);
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if (connection == NULL)
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g_bus_get (G_BUS_TYPE_SYSTEM, cancellable,
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get_bus_cb, g_steal_pointer (&task));
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else
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get_app_filter (connection, g_steal_pointer (&task));
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}
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static void
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get_bus_cb (GObject *obj,
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GAsyncResult *result,
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gpointer user_data)
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{
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g_autoptr(GTask) task = G_TASK (user_data);
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g_autoptr(GDBusConnection) connection = NULL;
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g_autoptr(GError) local_error = NULL;
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connection = g_bus_get_finish (result, &local_error);
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if (local_error != NULL)
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g_task_return_error (task, g_steal_pointer (&local_error));
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else
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get_app_filter (connection, g_steal_pointer (&task));
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}
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static void
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get_app_filter (GDBusConnection *connection,
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GTask *task)
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{
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g_autofree gchar *object_path = NULL;
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GCancellable *cancellable;
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GetAppFilterData *data = g_task_get_task_data (task);
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cancellable = g_task_get_cancellable (task);
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object_path = g_strdup_printf ("/org/freedesktop/Accounts/User%u",
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data->user_id);
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g_dbus_connection_call (connection,
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"org.freedesktop.Accounts",
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object_path,
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"org.freedesktop.DBus.Properties",
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"GetAll",
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g_variant_new ("(s)", "com.endlessm.ParentalControls.AppFilter"),
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G_VARIANT_TYPE ("(a{sv})"),
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data->allow_interactive_authorization
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? G_DBUS_CALL_FLAGS_ALLOW_INTERACTIVE_AUTHORIZATION
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: G_DBUS_CALL_FLAGS_NONE,
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-1, /* timeout, ms */
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cancellable,
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get_app_filter_cb,
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g_steal_pointer (&task));
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}
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static void
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get_app_filter_cb (GObject *obj,
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GAsyncResult *result,
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gpointer user_data)
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{
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GDBusConnection *connection = G_DBUS_CONNECTION (obj);
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g_autoptr(GTask) task = G_TASK (user_data);
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g_autoptr(GVariant) result_variant = NULL;
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g_autoptr(GVariant) properties = NULL;
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g_autoptr(GError) local_error = NULL;
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g_autoptr(EpcAppFilter) app_filter = NULL;
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gboolean is_whitelist;
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g_auto(GStrv) app_list = NULL;
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GetAppFilterData *data = g_task_get_task_data (task);
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result_variant = g_dbus_connection_call_finish (connection, result, &local_error);
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if (local_error != NULL)
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{
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g_autoptr(GError) app_filter_error = bus_error_to_app_filter_error (local_error,
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data->user_id);
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g_task_return_error (task, g_steal_pointer (&app_filter_error));
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return;
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}
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/* Extract the properties we care about. They may be silently omitted from the
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* results if we don’t have permission to access them. */
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properties = g_variant_get_child_value (result_variant, 0);
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if (!g_variant_lookup (properties, "app-filter", "(b^as)",
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&is_whitelist, &app_list))
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{
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g_task_return_new_error (task, EPC_APP_FILTER_ERROR,
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EPC_APP_FILTER_ERROR_PERMISSION_DENIED,
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_("Not allowed to query app filter data for user %u"),
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data->user_id);
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return;
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}
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/* Success. Create an #EpcAppFilter object to contain the results. */
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app_filter = g_new0 (EpcAppFilter, 1);
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app_filter->ref_count = 1;
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app_filter->user_id = data->user_id;
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app_filter->app_list = g_steal_pointer (&app_list);
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app_filter->app_list_type =
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is_whitelist ? EPC_APP_FILTER_LIST_WHITELIST : EPC_APP_FILTER_LIST_BLACKLIST;
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g_task_return_pointer (task, g_steal_pointer (&app_filter),
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(GDestroyNotify) epc_app_filter_unref);
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}
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/**
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* epc_get_app_filter_finish:
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* @result: a #GAsyncResult
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* @error: return location for a #GError, or %NULL
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*
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* Finish an asynchronous operation to get the app filter for a user, started
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* with epc_get_app_filter_async().
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*
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* Returns: (transfer full): app filter for the queried user
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* Since: 0.1.0
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*/
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EpcAppFilter *
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epc_get_app_filter_finish (GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (g_task_is_valid (result, NULL), NULL);
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g_return_val_if_fail (error == NULL || *error == NULL, NULL);
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return g_task_propagate_pointer (G_TASK (result), error);
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}
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@ -0,0 +1,84 @@
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
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*
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||||
* Copyright © 2018 Endless Mobile, Inc.
|
||||
*
|
||||
* 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 2.1 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
|
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors:
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* - Philip Withnall <withnall@endlessm.com>
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*/
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#pragma once
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#include <gio/gio.h>
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#include <glib.h>
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#include <glib-object.h>
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G_BEGIN_DECLS
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/**
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* EpcAppFilterError:
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* @EPC_APP_FILTER_ERROR_INVALID_USER: Given user ID doesn’t exist
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* @EPC_APP_FILTER_ERROR_PERMISSION_DENIED: Not authorized to query the app
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* filter for the given user
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*
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* Errors which can be returned by epc_get_app_filter_async().
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*
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* Since: 0.1.0
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*/
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typedef enum
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{
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EPC_APP_FILTER_ERROR_INVALID_USER,
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EPC_APP_FILTER_ERROR_PERMISSION_DENIED,
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} EpcAppFilterError;
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GQuark epc_app_filter_error_quark (void);
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#define EPC_APP_FILTER_ERROR epc_app_filter_error_quark ()
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/**
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* EpcAppFilter:
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*
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* #EpcAppFilter is an opaque, immutable structure which contains a snapshot of
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* the app filtering settings for a user at a given time. This includes a list
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* of apps which are explicitly banned or allowed to be run by that user.
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*
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* Typically, app filter settings can only be changed by the administrator, and
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* are read-only for non-administrative users. The precise policy is set using
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* polkit.
|
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*
|
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* Since: 0.1.0
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*/
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typedef struct _EpcAppFilter EpcAppFilter;
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GType epc_app_filter_get_type (void);
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|
||||
EpcAppFilter *epc_app_filter_ref (EpcAppFilter *filter);
|
||||
void epc_app_filter_unref (EpcAppFilter *filter);
|
||||
|
||||
G_DEFINE_AUTOPTR_CLEANUP_FUNC (EpcAppFilter, epc_app_filter_unref)
|
||||
|
||||
uid_t epc_app_filter_get_user_id (EpcAppFilter *filter);
|
||||
gboolean epc_app_filter_is_path_allowed (EpcAppFilter *filter,
|
||||
const gchar *path);
|
||||
|
||||
void epc_get_app_filter_async (GDBusConnection *connection,
|
||||
uid_t user_id,
|
||||
gboolean allow_interactive_authorization,
|
||||
GCancellable *cancellable,
|
||||
GAsyncReadyCallback callback,
|
||||
gpointer user_data);
|
||||
EpcAppFilter *epc_get_app_filter_finish (GAsyncResult *result,
|
||||
GError **error);
|
||||
|
||||
G_END_DECLS
|
||||
|
|
@ -0,0 +1,45 @@
|
|||
libeos_parental_controls_api_version = '0'
|
||||
libeos_parental_controls_api_name = 'eos-parental-controls-' + libeos_parental_controls_api_version
|
||||
libeos_parental_controls_sources = [
|
||||
'app-filter.c',
|
||||
]
|
||||
libeos_parental_controls_headers = [
|
||||
'app-filter.h',
|
||||
]
|
||||
|
||||
libeos_parental_controls_public_deps = [
|
||||
dependency('gio-2.0', version: '>= 2.44'),
|
||||
dependency('glib-2.0', version: '>= 2.54.2'),
|
||||
dependency('gobject-2.0', version: '>= 2.54'),
|
||||
]
|
||||
|
||||
# FIXME: Would be good to use subdir here: https://github.com/mesonbuild/meson/issues/2969
|
||||
libeos_parental_controls_include_subdir = join_paths(libeos_parental_controls_api_name, 'libeos-parental-controls')
|
||||
|
||||
libeos_parental_controls = library(libeos_parental_controls_api_name,
|
||||
libeos_parental_controls_sources + libeos_parental_controls_headers,
|
||||
dependencies: libeos_parental_controls_public_deps,
|
||||
include_directories: root_inc,
|
||||
install: true,
|
||||
version: meson.project_version(),
|
||||
soversion: libeos_parental_controls_api_version,
|
||||
)
|
||||
libeos_parental_controls_dep = declare_dependency(
|
||||
link_with: libeos_parental_controls,
|
||||
include_directories: root_inc,
|
||||
)
|
||||
|
||||
# Public library bits.
|
||||
install_headers(libeos_parental_controls_headers,
|
||||
subdir: libeos_parental_controls_include_subdir,
|
||||
)
|
||||
|
||||
pkgconfig.generate(
|
||||
libraries: [ libeos_parental_controls ],
|
||||
subdirs: libeos_parental_controls_api_name,
|
||||
version: meson.project_version(),
|
||||
name: 'libeos-parental-controls',
|
||||
filebase: libeos_parental_controls_api_name,
|
||||
description: 'Library providing access to parental control settings.',
|
||||
requires: libeos_parental_controls_public_deps,
|
||||
)
|
||||
72
meson.build
72
meson.build
|
|
@ -29,4 +29,76 @@ polkit_gobject = dependency('polkit-gobject-1')
|
|||
polkitpolicydir = polkit_gobject.get_pkgconfig_variable('policydir',
|
||||
define_variable: ['prefix', prefix])
|
||||
|
||||
config_h = configuration_data()
|
||||
config_h.set_quoted('GETTEXT_PACKAGE', meson.project_name())
|
||||
configure_file(
|
||||
output: 'config.h',
|
||||
configuration: config_h,
|
||||
)
|
||||
root_inc = include_directories('.')
|
||||
|
||||
# Enable warning flags
|
||||
test_c_args = [
|
||||
'-fno-strict-aliasing',
|
||||
'-fstack-protector-strong',
|
||||
'-Waggregate-return',
|
||||
'-Wall',
|
||||
'-Wunused',
|
||||
'-Warray-bounds',
|
||||
'-Wcast-align',
|
||||
'-Wclobbered',
|
||||
'-Wno-declaration-after-statement',
|
||||
'-Wduplicated-branches',
|
||||
'-Wduplicated-cond',
|
||||
'-Wempty-body',
|
||||
'-Wformat=2',
|
||||
'-Wformat-nonliteral',
|
||||
'-Wformat-security',
|
||||
'-Wformat-signedness',
|
||||
'-Wignored-qualifiers',
|
||||
'-Wimplicit-function-declaration',
|
||||
'-Wincompatible-pointer-types',
|
||||
'-Wincompatible-pointer-types-discards-qualifiers',
|
||||
'-Winit-self',
|
||||
'-Wint-conversion',
|
||||
'-Wlogical-op',
|
||||
'-Wmisleading-indentation',
|
||||
'-Wmissing-declarations',
|
||||
'-Wmissing-format-attribute',
|
||||
'-Wmissing-include-dirs',
|
||||
'-Wmissing-noreturn',
|
||||
'-Wmissing-parameter-type',
|
||||
'-Wmissing-prototypes',
|
||||
'-Wnested-externs',
|
||||
'-Wno-error=cpp',
|
||||
'-Wno-discarded-qualifiers',
|
||||
'-Wno-missing-field-initializers',
|
||||
'-Wno-suggest-attribute=format',
|
||||
'-Wno-unused-parameter',
|
||||
'-Wnull-dereference',
|
||||
'-Wold-style-definition',
|
||||
'-Woverflow',
|
||||
'-Woverride-init',
|
||||
'-Wparentheses',
|
||||
'-Wpointer-arith',
|
||||
'-Wredundant-decls',
|
||||
'-Wreturn-type',
|
||||
'-Wshadow',
|
||||
'-Wsign-compare',
|
||||
'-Wstrict-aliasing=2',
|
||||
'-Wstrict-prototypes',
|
||||
'-Wswitch-default',
|
||||
'-Wswitch-enum',
|
||||
'-Wtype-limits',
|
||||
'-Wundef',
|
||||
'-Wuninitialized',
|
||||
'-Wunused-but-set-variable',
|
||||
'-Wunused-result',
|
||||
'-Wunused-variable',
|
||||
'-Wwrite-strings'
|
||||
]
|
||||
cc = meson.get_compiler('c')
|
||||
add_project_arguments(cc.get_supported_arguments(test_c_args), language: 'c')
|
||||
|
||||
subdir('accounts-service')
|
||||
subdir('libeos-parental-controls')
|
||||
Loading…
Reference in New Issue