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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (c) 2013 Canonical Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Written by: Ryan Lortie <desrt@desrt.ca>
*/
#include "config.h"
#include "daemon.h"
#include <gio/gio.h>
#include <string.h>
static void
daemon_maybe_add_extension_interface (GHashTable *ifaces,
GDBusInterfaceInfo *iface)
{
gint i;
/* We visit the XDG data dirs in precedence order, so if we
* already have this one, we should not add it again.
*/
if (g_hash_table_contains (ifaces, iface->name))
return;
/* Only accept interfaces with only properties */
if ((iface->methods && iface->methods[0]) || (iface->signals && iface->signals[0]))
return;
/* Add it only if we can find the annotation */
for (i = 0; iface->annotations && iface->annotations[i]; i++) {
if (g_str_equal (iface->annotations[i]->key, "org.freedesktop.Accounts.VendorExtension")) {
g_hash_table_insert (ifaces, g_strdup (iface->name), g_dbus_interface_info_ref (iface));
return;
}
}
}
static void
daemon_read_extension_file (GHashTable *ifaces,
const gchar *filename)
{
GError *error = NULL;
GDBusNodeInfo *node;
gchar *contents;
gint i;
if (!g_file_get_contents (filename, &contents, NULL, &error)) {
g_warning ("Unable to read extension file %s: %s. Ignoring.", filename, error->message);
g_error_free (error);
return;
}
node = g_dbus_node_info_new_for_xml (contents, &error);
if (node) {
for (i = 0; node->interfaces && node->interfaces[i]; i++)
daemon_maybe_add_extension_interface (ifaces, node->interfaces[i]);
g_dbus_node_info_unref (node);
} else {
g_warning ("Failed to parse file %s: %s", filename, error->message);
g_error_free (error);
}
g_free (contents);
}
static void
daemon_read_extension_directory (GHashTable *ifaces,
const gchar *path)
{
const gchar *name;
GDir *dir;
dir = g_dir_open (path, 0, NULL);
if (!dir)
return;
while ((name = g_dir_read_name (dir))) {
gchar *filename;
gchar *symlink;
/* Extensions are installed as normal D-Bus interface
* files with an annotation.
*
* D-Bus interface files are supposed to be installed in
* $(datadir)/dbus-1/interfaces/ but we don't want to
* scan all of the files there looking for interfaces
* that may contain our annotation.
*
* The solution is to install a symlink into a directory
* private to accountsservice and point it at the file,
* as installed in the usual D-Bus directory.
*
* This ensures compatibility with the future if we ever
* decide to check the interfaces directory directly
* (which might be a reasonable thing to do if we ever
* get an efficient cache of the contents of this
* directory).
*
* By introducing such a restrictive way of doing this
* now we ensure that everyone will do it in this
* forwards-compatible way.
*/
filename = g_build_filename (path, name, NULL);
symlink = g_file_read_link (filename, NULL);
if (!symlink) {
g_warning ("Found accounts service vendor extension file %s, but file must be a symlink to "
"'../../dbus-1/interfaces/%s' for forwards-compatibility reasons.", filename, name);
g_free (filename);
continue;
}
/* Ensure it looks like "../../dbus-1/interfaces/${name}" */
const gchar * const prefix = "../../dbus-1/interfaces/";
if (g_str_has_prefix (symlink, prefix) && g_str_equal (symlink + strlen (prefix), name)) {
daemon_read_extension_file (ifaces, filename);
}
else {
g_warning ("Found accounts service vendor extension symlink %s, but it must be exactly "
"equal to '../../dbus-1/interfaces/%s' for forwards-compatibility reasons.",
filename, name);
}
g_free (filename);
g_free (symlink);
}
g_dir_close (dir);
}
GHashTable *
daemon_read_extension_ifaces (void)
{
const gchar * const *data_dirs;
GHashTable *ifaces;
gint i;
ifaces = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_dbus_interface_info_unref);
data_dirs = g_get_system_data_dirs ();
for (i = 0; data_dirs[i]; i++) {
gchar *path = g_build_filename (data_dirs[i], "accountsservice/interfaces", NULL);
daemon_read_extension_directory (ifaces, path);
g_free (path);
}
return ifaces;
}
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