path: root/dbind/dbind.c

/*
 * Copyright 2008-2011 Novell, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <stdio.h>
#include <stdarg.h>
#include <sys/time.h>
#include <string.h>
#include <glib.h>

#include "config.h"
#include "dbind/dbind.h"
#include "atspi/atspi-gmain.h"

static int dbind_timeout = -1;

/*
 * FIXME: compare types - to ensure they match &
 *        do dynamic padding of structures etc.
 */

/*---------------------------------------------------------------------------*/

typedef struct _SpiReentrantCallClosure 
{
  DBusMessage *reply;
} SpiReentrantCallClosure;

static void
set_reply (DBusPendingCall * pending, void *user_data)
{
  SpiReentrantCallClosure* closure = (SpiReentrantCallClosure *) user_data; 

  closure->reply = dbus_pending_call_steal_reply (pending);
  dbus_pending_call_unref (pending);
}

static gint
time_elapsed (struct timeval *origin)
{
  struct timeval tv;

  gettimeofday (&tv, NULL);
  return (tv.tv_sec - origin->tv_sec) * 1000 + (tv.tv_usec - origin->tv_usec) / 1000;
}

DBusMessage *
dbind_send_and_allow_reentry (DBusConnection * bus, DBusMessage * message, DBusError *error)
{
  DBusPendingCall *pending;
  SpiReentrantCallClosure *closure;
  const char *unique_name = dbus_bus_get_unique_name (bus);
  const char *destination = dbus_message_get_destination (message);
  struct timeval tv;
  DBusMessage *ret;

  if (unique_name && destination &&
      strcmp (destination, unique_name) != 0)
    return dbus_connection_send_with_reply_and_block (bus, message, dbind_timeout, error);

  closure = g_new0 (SpiReentrantCallClosure, 1);
  closure->reply = NULL;
  atspi_dbus_connection_setup_with_g_main(bus, NULL);
  if (!dbus_connection_send_with_reply (bus, message, &pending, dbind_timeout)
      || !pending)
    {
      g_free (closure);
      return NULL;
    }
  dbus_pending_call_set_notify (pending, set_reply, (void *) closure, g_free);

  closure->reply = NULL;
  gettimeofday (&tv, NULL);
  dbus_pending_call_ref (pending);
  while (!closure->reply)
    {
      if (!dbus_connection_read_write_dispatch (bus, dbind_timeout))
        {
          //dbus_pending_call_set_notify (pending, NULL, NULL, NULL);
          dbus_pending_call_cancel (pending);
          dbus_pending_call_unref (pending);
          return NULL;
        }
      if (time_elapsed (&tv) > dbind_timeout)
        {
          //dbus_pending_call_set_notify (pending, NULL, NULL, NULL);
          dbus_pending_call_cancel (pending);
          dbus_pending_call_unref (pending);
          dbus_set_error_const (error, "org.freedesktop.DBus.Error.NoReply",
                                "timeout from dbind");
          return NULL;
        }
    }
  
  ret = closure->reply;
  dbus_pending_call_unref (pending);
  return ret;
}

dbus_bool_t
dbind_method_call_reentrant_va (DBusConnection *cnx,
                                const char     *bus_name,
                                const char     *path,
                                const char     *interface,
                                const char     *method,
                                DBusError      *opt_error,
                                const char     *arg_types,
                                va_list         args)
{
    dbus_bool_t success = FALSE;
    DBusMessage *msg = NULL, *reply = NULL;
    DBusMessageIter iter;
    DBusError *err, real_err;
    const char *p;
  va_list args_demarshal;

  dbus_error_init (&real_err);

  va_copy (args_demarshal, args);
    if (opt_error)
        err = opt_error;
    else {
        err = &real_err;
    }

    msg = dbus_message_new_method_call (bus_name, path, interface, method);
    if (!msg)
        goto out;

    p = arg_types;
    dbus_message_iter_init_append (msg, &iter);
    dbind_any_marshal_va (&iter, &p, args);

    reply = dbind_send_and_allow_reentry (cnx, msg, err);
    if (!reply)
        goto out;

    if (dbus_message_get_type (reply) == DBUS_MESSAGE_TYPE_ERROR)
    {
      const char *name = dbus_message_get_error_name (reply);
      goto out;
    }
    /* demarshal */
    if (p[0] == '=' && p[1] == '>')
    {
        DBusMessageIter iter;
        dbus_message_iter_init (reply, &iter);
	if (strcmp (p + 2, dbus_message_get_signature (reply)) != 0)
	{
	    g_warning ("dbind: Call to \"%s\" returned signature %s; expected %s",
		       method, dbus_message_get_signature (reply), p + 2);
	    if (opt_error)
	        dbus_set_error (opt_error, DBUS_ERROR_INVALID_ARGS,
		                "Call to \"%s\" returned signature %s; expected %s",
		                method, dbus_message_get_signature (reply),
                                p + 2);
	    goto out;
	}
        p = arg_types;
        dbind_any_demarshal_va (&iter, &p, args_demarshal);
    }

    success = TRUE;
out:
    if (msg)
        dbus_message_unref (msg);

    if (reply)
        dbus_message_unref (reply);

    if (dbus_error_is_set (&real_err))
        dbus_error_free (&real_err);

    va_end (args_demarshal);
    return success;
}

/**
 * dbind_method_call_reentrant:
 *
 * @cnx:       A D-Bus Connection used to make the method call.
 * @bus_name:  The D-Bus bus name of the program where the method call should
 *             be made.
 * @path:      The D-Bus object path that should handle the method.
 * @interface: The D-Bus interface used to scope the method name.
 * @method:    Method to be invoked.
 * @opt_error: D-Bus error.
 * @arg_types: Variable length arguments interleaving D-Bus argument types
 *             and pointers to argument data.
 *
 * Makes a D-Bus method call using the supplied location data, method name and
 * argument data.This function is re-entrant. It continuously reads from the D-Bus
 * bus and dispatches messages until a reply has been recieved.
 **/
dbus_bool_t
dbind_method_call_reentrant (DBusConnection *cnx,
                             const char     *bus_name,
                             const char     *path,
                             const char     *interface,
                             const char     *method,
                             DBusError      *opt_error,
                             const char     *arg_types,
                             ...)
{
    dbus_bool_t success = FALSE;
    va_list args;

    va_start (args, arg_types);
    success = dbind_method_call_reentrant_va (cnx,
                                              bus_name,
                                              path,
                                              interface,
                                              method,
                                              opt_error,
                                              arg_types,
                                              args);
    va_end (args);

    return success;
}

/*---------------------------------------------------------------------------*/

dbus_bool_t
dbind_emit_signal_va (DBusConnection *cnx,
                      const char     *path,
                      const char     *interface,
                      const char     *signal,
                      DBusError      *opt_error,
                      const char     *arg_types,
                      va_list         args)
{
    dbus_bool_t success = FALSE;
    DBusMessage *msg = NULL;
    DBusMessageIter iter;
    DBusError *err, real_err;
    const char *p;

    dbus_error_init (&real_err);

    if (opt_error)
        err = opt_error;
    else {
        err = &real_err;
    }

    msg = dbus_message_new_signal (path, interface, signal);
    if (!msg)
        goto out;

    p = arg_types;
    dbus_message_iter_init_append (msg, &iter);
    dbind_any_marshal_va (&iter, &p, args);

    if (!dbus_connection_send (cnx, msg, NULL))
       goto out;

    success = TRUE;
out:

    if (msg)
        dbus_message_unref (msg);

    if (dbus_error_is_set (&real_err))
        dbus_error_free (&real_err);

    return success;
}

/**
 * dbind_emit_signal:
 *
 * @cnx:       A D-Bus Connection used to make the method call.
 * @path:      The D-Bus object path that this signal is emitted from.
 * @interface: The D-Bus interface used to scope the method name.
 * @signal:    Name of signal to emit.
 * @opt_error: D-Bus error.
 * @arg_types: Variable length arguments interleaving D-Bus argument types
 *             and pointers to argument data.
 *
 * Emits a D-Bus signal  using the supplied signal name and argument data.
 **/
dbus_bool_t
dbind_emit_signal (DBusConnection *cnx,
                   const char     *path,
                   const char     *interface,
                   const char     *signal,
                   DBusError      *opt_error,
                   const char     *arg_types,
                   ...)
{
    dbus_bool_t success = FALSE;
    va_list args;

    va_start (args, arg_types);
    success = dbind_emit_signal_va (cnx, path, interface, signal, opt_error, arg_types, args);
    va_end (args);

    return success;
}
void
dbind_set_timeout (int timeout)
{
  dbind_timeout = timeout;
}


/*END------------------------------------------------------------------------*/