199 lines
5.6 KiB
C
199 lines
5.6 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) 2008,2009,2010,2011 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 "helpers.h"
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#include "method.h"
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void cdbus_error(struct cdbus_method_call * call_ptr, const char * err_name, const char * format, ...)
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{
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va_list ap;
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char message[1024];
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const char *interface_name;
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va_start(ap, format);
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vsnprintf(message, sizeof(message), format, ap);
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message[sizeof(message) - 1] = '\0';
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va_end(ap);
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if (call_ptr != NULL)
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{
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interface_name = (call_ptr->iface && call_ptr->iface->name && call_ptr->iface->name[0]) ? call_ptr->iface->name : "<unknown>";
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log_error("In method %s.%s: %s", interface_name, call_ptr->method_name, message);
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call_ptr->reply = dbus_message_new_error(call_ptr->message, err_name, message);
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}
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else
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{
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log_error("%s", message);
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}
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}
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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_ptr->reply will be set to NULL and handled in send_method_return().
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*/
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void cdbus_method_return_new_void(struct cdbus_method_call * call_ptr)
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{
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if (!(call_ptr->reply = dbus_message_new_method_return(call_ptr->message))) {
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log_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_ptr->reply will be set to NULL and handled in send_method_return().
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*/
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void cdbus_method_return_new_single(struct cdbus_method_call * call_ptr, int type, const void * arg)
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{
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if (!call_ptr || !arg) {
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log_error("Invalid arguments");
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return;
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}
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call_ptr->reply = dbus_message_new_method_return(call_ptr->message);
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if (!call_ptr->reply)
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goto fail_no_mem;
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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_ptr->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_ptr->reply);
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call_ptr->reply = NULL;
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fail_no_mem:
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log_error("Ran out of memory trying to construct method return");
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}
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void cdbus_method_return_new_valist(struct cdbus_method_call * call_ptr, int type, ...)
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{
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if (!call_ptr) {
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log_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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log_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_ptr->reply = dbus_message_new_method_return(call_ptr->message);
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if (!call_ptr->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_ptr->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_ptr->reply);
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call_ptr->reply = NULL;
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fail_no_mem:
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log_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_ptr->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 cdbus_method_return_send(struct cdbus_method_call * call_ptr)
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{
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if (call_ptr->reply) {
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retry_send:
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if (!dbus_connection_send(call_ptr->connection, call_ptr->reply, NULL))
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log_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_ptr->connection);
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dbus_message_unref(call_ptr->reply);
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call_ptr->reply = NULL;
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} else {
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log_debug("Message was NULL, trying to construct a void return");
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if ((call_ptr->reply = dbus_message_new_method_return(call_ptr->message))) {
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log_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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log_error("Failed to construct method return!");
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}
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}
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}
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bool cdbus_method_return_verify(DBusMessage * msg, 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, &cdbus_g_dbus_error,
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DBUS_TYPE_STRING, &ptr,
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DBUS_TYPE_INVALID)) {
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log_error("Cannot read description from D-Bus error message: %s ",
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cdbus_g_dbus_error.message);
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dbus_error_free(&cdbus_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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