355 lines
9.6 KiB
C
355 lines
9.6 KiB
C
/* -*- Mode: C ; c-basic-offset: 2 -*- */
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/*
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* LADI Session Handler (ladish)
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*
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* Copyright (C) 2008, 2009 Nedko Arnaudov <nedko@arnaudov.name>
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* Copyright (C) 2008 Juuso Alasuutari <juuso.alasuutari@gmail.com>
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*
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**************************************************************************
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* This file contains D-Bus methods helpers
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**************************************************************************
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*
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* Licensed under the Academic Free License version 2.1
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*
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* LADI Session Handler is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* LADI Session Handler 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
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* or write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "../common.h"
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#include "../common/safety.h"
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#include "helpers.h"
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#include "method.h"
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/*
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* Construct a void method return.
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*
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* The operation can only fail due to lack of memory, in which case
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* there's no sense in trying to construct an error return. Instead,
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* call->reply will be set to NULL and handled in send_method_return().
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*/
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void
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method_return_new_void(method_call_t *call)
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{
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if (!(call->reply = dbus_message_new_method_return(call->message))) {
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lash_error("Ran out of memory trying to construct method return");
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}
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}
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/*
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* Construct a method return which holds a single argument or, if
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* the type parameter is DBUS_TYPE_INVALID, no arguments at all
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* (a void message).
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*
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* The operation can only fail due to lack of memory, in which case
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* there's no sense in trying to construct an error return. Instead,
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* call->reply will be set to NULL and handled in send_method_return().
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*/
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void
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method_return_new_single(method_call_t *call,
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int type,
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const void *arg)
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{
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if (!call || !arg) {
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lash_error("Invalid arguments");
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return;
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}
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call->reply = dbus_message_new_method_return(call->message);
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if (!call->reply)
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goto fail_no_mem;
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/* Void method return requested by caller. */
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// TODO: do we really need this?
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if (type == DBUS_TYPE_INVALID)
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return;
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/* Prevent crash on NULL input string. */
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if (type == DBUS_TYPE_STRING && !(*((const char **) arg)))
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*((const char **) arg) = "";
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DBusMessageIter iter;
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dbus_message_iter_init_append(call->reply, &iter);
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if (dbus_message_iter_append_basic(&iter, type, arg))
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return;
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dbus_message_unref(call->reply);
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call->reply = NULL;
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fail_no_mem:
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lash_error("Ran out of memory trying to construct method return");
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}
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void
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method_return_new_valist(method_call_t *call,
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int type,
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...)
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{
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if (!call) {
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lash_error("Call pointer is NULL");
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return;
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}
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if (type == DBUS_TYPE_INVALID) {
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lash_error("No argument(s) supplied");
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return;
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}
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va_list argp;
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call->reply = dbus_message_new_method_return(call->message);
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if (!call->reply)
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goto fail_no_mem;
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va_start(argp, type);
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if (dbus_message_append_args_valist(call->reply, type, argp)) {
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va_end(argp);
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return;
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}
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va_end(argp);
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dbus_message_unref(call->reply);
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call->reply = NULL;
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fail_no_mem:
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lash_error("Ran out of memory trying to construct method return");
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}
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/*
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* Send a method return.
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*
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* If call->reply is NULL, i.e. a previous attempt to construct
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* a return has failed, attempt to send a void return.
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*/
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void
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method_return_send(method_call_t *call)
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{
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if (call->reply) {
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retry_send:
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if (!dbus_connection_send(call->connection, call->reply, NULL))
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lash_error("Ran out of memory trying to queue "
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"method return");
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else
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dbus_connection_flush(call->connection);
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dbus_message_unref(call->reply);
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call->reply = NULL;
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} else {
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lash_debug("Message was NULL, trying to construct a void return");
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if ((call->reply = dbus_message_new_method_return(call->message))) {
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lash_debug("Constructed a void return, trying to queue it");
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goto retry_send;
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} else {
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lash_error("Failed to construct method return!");
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}
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}
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}
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bool
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method_return_verify(DBusMessage *msg,
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const char **str)
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{
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if (!msg || dbus_message_get_type(msg) != DBUS_MESSAGE_TYPE_ERROR)
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return true;
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const char *ptr;
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if (!dbus_message_get_args(msg, &g_dbus_error,
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DBUS_TYPE_STRING, &ptr,
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DBUS_TYPE_INVALID)) {
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lash_error("Cannot read description from D-Bus error message: %s ",
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g_dbus_error.message);
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dbus_error_free(&g_dbus_error);
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ptr = NULL;
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}
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if (str)
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*str = ptr;
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return false;
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}
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/*
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* Append a variant type to a D-Bus message.
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* Return false if something fails, true otherwise.
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*/
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bool
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method_iter_append_variant(DBusMessageIter *iter,
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int type,
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const void *arg)
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{
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DBusMessageIter sub_iter;
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char s[2];
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s[0] = (char) type;
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s[1] = '\0';
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/* Open a variant container. */
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if (!dbus_message_iter_open_container(iter, DBUS_TYPE_VARIANT,
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(const char *) s, &sub_iter))
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return false;
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/* Append the supplied value. */
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if (!dbus_message_iter_append_basic(&sub_iter, type, arg)) {
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dbus_message_iter_close_container(iter, &sub_iter);
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return false;
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}
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/* Close the container. */
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if (!dbus_message_iter_close_container(iter, &sub_iter))
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return false;
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return true;
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}
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static __inline__ bool
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method_iter_append_variant_raw(DBusMessageIter *iter,
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const void *buf,
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int len)
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{
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DBusMessageIter variant_iter, array_iter;
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/* Open a variant container. */
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if (!dbus_message_iter_open_container(iter, DBUS_TYPE_VARIANT,
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"ay", &variant_iter))
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return false;
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/* Open an array container. */
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if (!dbus_message_iter_open_container(&variant_iter, DBUS_TYPE_ARRAY,
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"y", &array_iter))
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goto fail;
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/* Append the supplied data. */
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if (!dbus_message_iter_append_fixed_array(&array_iter, DBUS_TYPE_BYTE, buf, len)) {
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dbus_message_iter_close_container(&variant_iter, &array_iter);
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goto fail;
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}
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/* Close the containers. */
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if (!dbus_message_iter_close_container(&variant_iter, &array_iter))
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goto fail;
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else if (!dbus_message_iter_close_container(iter, &variant_iter))
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return false;
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return true;
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fail:
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dbus_message_iter_close_container(iter, &variant_iter);
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return false;
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}
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bool
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method_iter_append_dict_entry(DBusMessageIter *iter,
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int type,
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const char *key,
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const void *value,
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int length)
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{
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DBusMessageIter dict_iter;
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if (!dbus_message_iter_open_container(iter, DBUS_TYPE_DICT_ENTRY,
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NULL, &dict_iter))
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return false;
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if (!dbus_message_iter_append_basic(&dict_iter, DBUS_TYPE_STRING, &key))
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goto fail;
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if (type == '-') {
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if (!method_iter_append_variant_raw(&dict_iter, value, length))
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goto fail;
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} else if (!method_iter_append_variant(&dict_iter, type, value))
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goto fail;
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if (!dbus_message_iter_close_container(iter, &dict_iter))
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return false;
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return true;
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fail:
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dbus_message_iter_close_container(iter, &dict_iter);
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return false;
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}
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bool
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method_iter_get_dict_entry(DBusMessageIter *iter,
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const char **key_ptr,
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void *value_ptr,
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int *type_ptr,
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int *size_ptr)
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{
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if (!iter || !key_ptr || !value_ptr || !type_ptr) {
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lash_error("Invalid arguments");
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return false;
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}
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DBusMessageIter dict_iter, variant_iter;
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if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_DICT_ENTRY) {
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lash_error("Iterator does not point to a dict entry container");
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return false;
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}
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dbus_message_iter_recurse(iter, &dict_iter);
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if (dbus_message_iter_get_arg_type(&dict_iter) != DBUS_TYPE_STRING) {
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lash_error("Cannot find key in dict entry container");
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return false;
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}
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dbus_message_iter_get_basic(&dict_iter, key_ptr);
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if (!dbus_message_iter_next(&dict_iter)
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|| dbus_message_iter_get_arg_type(&dict_iter) != DBUS_TYPE_VARIANT) {
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lash_error("Cannot find variant container in dict entry");
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return false;
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}
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dbus_message_iter_recurse(&dict_iter, &variant_iter);
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*type_ptr = dbus_message_iter_get_arg_type(&variant_iter);
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if (*type_ptr == DBUS_TYPE_INVALID) {
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lash_error("Cannot find value in variant container");
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return false;
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}
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if (*type_ptr == DBUS_TYPE_ARRAY) {
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DBusMessageIter array_iter;
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int n;
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if (dbus_message_iter_get_element_type(&variant_iter)
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!= DBUS_TYPE_BYTE) {
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lash_error("Dict entry value is a non-byte array");
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return false;
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}
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*type_ptr = '-';
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dbus_message_iter_recurse(&variant_iter, &array_iter);
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dbus_message_iter_get_fixed_array(&array_iter, value_ptr, &n);
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if (size_ptr)
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*size_ptr = n;
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} else
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dbus_message_iter_get_basic(&variant_iter, value_ptr);
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return true;
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}
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/* EOF */
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