glib/gio/tests/gdbus-serialization.c

/* GLib testing framework examples and tests
 *
 * Copyright (C) 2008-2010 Red Hat, 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 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 Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: David Zeuthen <davidz@redhat.com>
 */

#include <locale.h>
#include <gio/gio.h>

#include <string.h>
#include <unistd.h>
#include <dbus/dbus.h>

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

static void
hexdump (const guchar *str, gsize len)
{
  const guchar *data = (const guchar *) str;
  guint n, m;

  for (n = 0; n < len; n += 16)
    {
      g_printerr ("%04x: ", n);

      for (m = n; m < n + 16; m++)
        {
          if (m > n && (m%4) == 0)
            g_printerr (" ");
          if (m < len)
            g_printerr ("%02x ", data[m]);
          else
            g_printerr ("   ");
        }

      g_printerr ("   ");

      for (m = n; m < len && m < n + 16; m++)
        g_printerr ("%c", g_ascii_isprint (data[m]) ? data[m] : '.');

      g_printerr ("\n");
    }
}

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

static gboolean
append_gv_to_dbus_iter (DBusMessageIter  *iter,
                        GVariant         *value,
                        GError          **error)
{
  const GVariantType *type;

  type = g_variant_get_type (value);
  if (g_variant_type_equal (type, G_VARIANT_TYPE_BOOLEAN))
    {
      dbus_bool_t v = g_variant_get_boolean (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_BOOLEAN, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_BYTE))
    {
      guint8 v = g_variant_get_byte (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_BYTE, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT16))
    {
      gint16 v = g_variant_get_int16 (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_INT16, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT16))
    {
      guint16 v = g_variant_get_uint16 (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_UINT16, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT32))
    {
      gint32 v = g_variant_get_int32 (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_INT32, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT32))
    {
      guint32 v = g_variant_get_uint32 (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_UINT32, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT64))
    {
      gint64 v = g_variant_get_int64 (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_INT64, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT64))
    {
      guint64 v = g_variant_get_uint64 (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_UINT64, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_DOUBLE))
    {
      gdouble v = g_variant_get_double (value);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_DOUBLE, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_STRING))
    {
      const gchar *v = g_variant_get_string (value, NULL);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_STRING, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_OBJECT_PATH))
    {
      const gchar *v = g_variant_get_string (value, NULL);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_OBJECT_PATH, &v);
    }
  else if (g_variant_type_equal (type, G_VARIANT_TYPE_SIGNATURE))
    {
      const gchar *v = g_variant_get_string (value, NULL);
      dbus_message_iter_append_basic (iter, DBUS_TYPE_SIGNATURE, &v);
    }
  else if (g_variant_type_is_variant (type))
    {
      DBusMessageIter sub;
      GVariant *child;

      child = g_variant_get_child_value (value, 0);
      dbus_message_iter_open_container (iter, DBUS_TYPE_VARIANT,
                                        g_variant_get_type_string (child),
                                        &sub);
      if (!append_gv_to_dbus_iter (&sub, child, error))
        {
            g_variant_unref (child);
            goto fail;
        }
      dbus_message_iter_close_container (iter, &sub);
      g_variant_unref (child);
    }
  else if (g_variant_type_is_array (type))
    {
      DBusMessageIter dbus_iter;
      const gchar *type_string;
      GVariantIter gv_iter;
      GVariant *item;

      type_string = g_variant_get_type_string (value);
      type_string++; /* skip the 'a' */

      dbus_message_iter_open_container (iter, DBUS_TYPE_ARRAY,
                                        type_string, &dbus_iter);
      g_variant_iter_init (&gv_iter, value);

      while ((item = g_variant_iter_next_value (&gv_iter)))
        {
          if (!append_gv_to_dbus_iter (&dbus_iter, item, error))
            {
              goto fail;
            }
        }

      dbus_message_iter_close_container (iter, &dbus_iter);
    }
  else if (g_variant_type_is_tuple (type))
    {
      DBusMessageIter dbus_iter;
      GVariantIter gv_iter;
      GVariant *item;

      dbus_message_iter_open_container (iter, DBUS_TYPE_STRUCT,
                                        NULL, &dbus_iter);
      g_variant_iter_init (&gv_iter, value);

      while ((item = g_variant_iter_next_value (&gv_iter)))
        {
          if (!append_gv_to_dbus_iter (&dbus_iter, item, error))
            goto fail;
        }

      dbus_message_iter_close_container (iter, &dbus_iter);
    }
  else if (g_variant_type_is_dict_entry (type))
    {
      DBusMessageIter dbus_iter;
      GVariant *key, *val;

      dbus_message_iter_open_container (iter, DBUS_TYPE_DICT_ENTRY,
                                        NULL, &dbus_iter);
      key = g_variant_get_child_value (value, 0);
      if (!append_gv_to_dbus_iter (&dbus_iter, key, error))
        {
          g_variant_unref (key);
          goto fail;
        }
      g_variant_unref (key);

      val = g_variant_get_child_value (value, 1);
      if (!append_gv_to_dbus_iter (&dbus_iter, val, error))
        {
          g_variant_unref (val);
          goto fail;
        }
      g_variant_unref (val);

      dbus_message_iter_close_container (iter, &dbus_iter);
    }
  else
    {
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_INVALID_ARGUMENT,
                   "Error serializing GVariant with type-string `%s' to a D-Bus message",
                   g_variant_get_type_string (value));
      goto fail;
    }

  return TRUE;

 fail:
  return FALSE;
}

static gboolean
append_gv_to_dbus_message (DBusMessage  *message,
                           GVariant     *value,
                           GError      **error)
{
  gboolean ret;
  guint n;

  ret = FALSE;

  if (value != NULL)
    {
      DBusMessageIter iter;
      GVariantIter gv_iter;
      GVariant *item;

      dbus_message_iter_init_append (message, &iter);

      g_variant_iter_init (&gv_iter, value);
      n = 0;
      while ((item = g_variant_iter_next_value (&gv_iter)))
        {
          if (!append_gv_to_dbus_iter (&iter, item, error))
            {
              g_prefix_error (error,
                              "Error encoding in-arg %d: ",
                              n);
              goto out;
            }
          n++;
        }
    }

  ret = TRUE;

 out:
  return ret;
}

static void
print_gv_dbus_message (GVariant *value)
{
  DBusMessage *message;
  char *blob;
  int blob_len;
  GError *error;

  message = dbus_message_new (DBUS_MESSAGE_TYPE_METHOD_CALL);
  dbus_message_set_serial (message, 0x41);
  dbus_message_set_path (message, "/foo/bar");
  dbus_message_set_member (message, "Member");

  error = NULL;
  if (!append_gv_to_dbus_message (message, value, &error))
    {
      g_printerr ("Error printing GVariant as DBusMessage: %s", error->message);
      g_error_free (error);
      goto out;
    }

  dbus_message_marshal (message, &blob, &blob_len);
  g_printerr ("\n");
  hexdump ((guchar *) blob, blob_len);
 out:
  dbus_message_unref (message);
}

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

static void
dbus_1_message_append (GString *s,
                       guint indent,
                       DBusMessageIter *iter)
{
  gint arg_type;
  DBusMessageIter sub;

  g_string_append_printf (s, "%*s", indent, "");

  arg_type = dbus_message_iter_get_arg_type (iter);
  switch (arg_type)
    {
     case DBUS_TYPE_BOOLEAN:
      {
        dbus_bool_t value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "bool: %s\n", value ? "true" : "false");
        break;
      }

     case DBUS_TYPE_BYTE:
      {
        guchar value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "byte: 0x%02x\n", (guint) value);
        break;
      }

     case DBUS_TYPE_INT16:
      {
        gint16 value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "int16: %" G_GINT16_FORMAT "\n", value);
        break;
      }

     case DBUS_TYPE_UINT16:
      {
        guint16 value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "uint16: %" G_GUINT16_FORMAT "\n", value);
        break;
      }

     case DBUS_TYPE_INT32:
      {
        gint32 value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "int32: %" G_GINT32_FORMAT "\n", value);
        break;
      }

     case DBUS_TYPE_UINT32:
      {
        guint32 value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "uint32: %" G_GUINT32_FORMAT "\n", value);
        break;
      }

     case DBUS_TYPE_INT64:
      {
        gint64 value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "int64: %" G_GINT64_FORMAT "\n", value);
        break;
      }

     case DBUS_TYPE_UINT64:
      {
        guint64 value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "uint64: %" G_GUINT64_FORMAT "\n", value);
        break;
      }

     case DBUS_TYPE_DOUBLE:
      {
        gdouble value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "double: %f\n", value);
        break;
      }

     case DBUS_TYPE_STRING:
      {
        const gchar *value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "string: `%s'\n", value);
        break;
      }

     case DBUS_TYPE_OBJECT_PATH:
      {
        const gchar *value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "object_path: `%s'\n", value);
        break;
      }

     case DBUS_TYPE_SIGNATURE:
      {
        const gchar *value;
        dbus_message_iter_get_basic (iter, &value);
        g_string_append_printf (s, "signature: `%s'\n", value);
        break;
      }

#ifdef DBUS_TYPE_UNIX_FD
    case DBUS_TYPE_UNIX_FD:
      {
        /* unfortunately there's currently no way to get just the
         * protocol value, since dbus_message_iter_get_basic() wants
         * to be 'helpful' and dup the fd for the user...
         */
        g_string_append (s, "unix-fd: (not extracted)\n");
        break;
      }
#endif

     case DBUS_TYPE_VARIANT:
       g_string_append_printf (s, "variant:\n");
       dbus_message_iter_recurse (iter, &sub);
       while (dbus_message_iter_get_arg_type (&sub))
         {
           dbus_1_message_append (s, indent + 2, &sub);
           dbus_message_iter_next (&sub);
         }
       break;

     case DBUS_TYPE_ARRAY:
       g_string_append_printf (s, "array:\n");
       dbus_message_iter_recurse (iter, &sub);
       while (dbus_message_iter_get_arg_type (&sub))
         {
           dbus_1_message_append (s, indent + 2, &sub);
           dbus_message_iter_next (&sub);
         }
       break;

     case DBUS_TYPE_STRUCT:
       g_string_append_printf (s, "struct:\n");
       dbus_message_iter_recurse (iter, &sub);
       while (dbus_message_iter_get_arg_type (&sub))
         {
           dbus_1_message_append (s, indent + 2, &sub);
           dbus_message_iter_next (&sub);
         }
       break;

     case DBUS_TYPE_DICT_ENTRY:
       g_string_append_printf (s, "dict_entry:\n");
       dbus_message_iter_recurse (iter, &sub);
       while (dbus_message_iter_get_arg_type (&sub))
         {
           dbus_1_message_append (s, indent + 2, &sub);
           dbus_message_iter_next (&sub);
         }
       break;

     default:
       g_printerr ("Error serializing D-Bus message to GVariant. Unsupported arg type `%c' (%d)",
                   arg_type,
                   arg_type);
       g_assert_not_reached ();
       break;
    }
}

static gchar *
dbus_1_message_print (DBusMessage *message)
{
  GString *s;
  guint n;
  DBusMessageIter iter;

  s = g_string_new (NULL);
  n = 0;
  dbus_message_iter_init (message, &iter);
  while (dbus_message_iter_get_arg_type (&iter) != DBUS_TYPE_INVALID)
    {
      g_string_append_printf (s, "value %d: ", n);
      dbus_1_message_append (s, 2, &iter);
      dbus_message_iter_next (&iter);
      n++;
    }

  return g_string_free (s, FALSE);
}

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

static gchar *
get_body_signature (GVariant *value)
{
  const gchar *s;
  gsize len;
  gchar *ret;

  if (value == NULL)
    {
      ret = g_strdup ("");
      goto out;
    }

  s = g_variant_get_type_string (value);
  len = strlen (s);
  g_assert (len >= 2);

  ret = g_strndup (s + 1, len - 2);

 out:
  return ret;
}

static void
check_serialization (GVariant *value,
                     const gchar *expected_dbus_1_output)
{
  guchar *blob;
  gsize blob_size;
  DBusMessage *dbus_1_message;
  GDBusMessage *message;
  GDBusMessage *recovered_message;
  GError *error;
  DBusError dbus_error;
  gchar *s;
  gchar *s1;
  guint n;

  message = g_dbus_message_new ();
  g_dbus_message_set_body (message, value);
  g_dbus_message_set_message_type (message, G_DBUS_MESSAGE_TYPE_METHOD_CALL);
  g_dbus_message_set_serial (message, 0x41);
  s = get_body_signature (value);
  g_dbus_message_set_header (message, G_DBUS_MESSAGE_HEADER_FIELD_PATH, g_variant_new_object_path ("/foo/bar"));
  g_dbus_message_set_header (message, G_DBUS_MESSAGE_HEADER_FIELD_MEMBER, g_variant_new_string ("Member"));
  g_dbus_message_set_header (message, G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE, g_variant_new_signature (s));
  g_free (s);

  /* First check that the serialization to the D-Bus wire format is correct - do this for both byte orders */
  for (n = 0; n < 2; n++)
    {
      GDBusMessageByteOrder byte_order;
      switch (n)
        {
        case 0:
          byte_order = G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN;
          break;
        case 1:
          byte_order = G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN;
          break;
        case 2:
          g_assert_not_reached ();
          break;
        }
      g_dbus_message_set_byte_order (message, byte_order);

      error = NULL;
      blob = g_dbus_message_to_blob (message,
                                     &blob_size,
                                     G_DBUS_CAPABILITY_FLAGS_NONE,
                                     &error);
      g_assert_no_error (error);
      g_assert (blob != NULL);

      switch (byte_order)
        {
        case G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN:
          g_assert_cmpint (blob[0], ==, 'B');
          break;
        case G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN:
          g_assert_cmpint (blob[0], ==, 'l');
          break;
        }

      dbus_error_init (&dbus_error);
      dbus_1_message = dbus_message_demarshal ((char *) blob, blob_size, &dbus_error);
      if (dbus_error_is_set (&dbus_error))
        {
          g_printerr ("Error calling dbus_message_demarshal() on this blob: %s: %s\n",
                      dbus_error.name,
                      dbus_error.message);
          hexdump (blob, blob_size);
          dbus_error_free (&dbus_error);

          s = g_variant_print (value, TRUE);
          g_printerr ("\nThe blob was generated from the following GVariant value:\n%s\n\n", s);
          g_free (s);

          g_printerr ("If the blob was encoded using DBusMessageIter, the payload would have been:\n");
          print_gv_dbus_message (value);

          g_assert_not_reached ();
        }

      s = dbus_1_message_print (dbus_1_message);
      dbus_message_unref (dbus_1_message);

      g_assert_cmpstr (s, ==, expected_dbus_1_output);
      g_free (s);

      /* Then serialize back and check that the body is identical */

      error = NULL;
      recovered_message = g_dbus_message_new_from_blob (blob,
                                                        blob_size,
                                                        G_DBUS_CAPABILITY_FLAGS_NONE,
                                                        &error);
      g_assert (recovered_message != NULL);
      g_assert_no_error (error);

      if (value == NULL)
        {
          g_assert (g_dbus_message_get_body (recovered_message) == NULL);
        }
      else
        {
          g_assert (g_dbus_message_get_body (recovered_message) != NULL);
          if (!g_variant_equal (g_dbus_message_get_body (recovered_message), value))
            {
              s = g_variant_print (g_dbus_message_get_body (recovered_message), TRUE);
              s1 = g_variant_print (value, TRUE);
              g_printerr ("Recovered value:\n%s\ndoes not match given value\n%s\n",
                          s,
                          s1);
              g_free (s);
              g_free (s1);
              g_assert_not_reached ();
            }
        }
      g_object_unref (recovered_message);
    }

  g_object_unref (message);
}

static void
message_serialize_basic (void)
{
  check_serialization (NULL, "");

  check_serialization (g_variant_new ("(sogybnqiuxtd)",
                                      "this is a string",
                                      "/this/is/a/path",
                                      "sad",
                                      42,
                                      TRUE,
                                      -42,
                                      60000,
                                      -44,
                                      100000,
                                      -G_GINT64_CONSTANT(2)<<34,
                                      G_GUINT64_CONSTANT(0xffffffffffffffff),
                                      42.5),
                       "value 0:   string: `this is a string'\n"
                       "value 1:   object_path: `/this/is/a/path'\n"
                       "value 2:   signature: `sad'\n"
                       "value 3:   byte: 0x2a\n"
                       "value 4:   bool: true\n"
                       "value 5:   int16: -42\n"
                       "value 6:   uint16: 60000\n"
                       "value 7:   int32: -44\n"
                       "value 8:   uint32: 100000\n"
                       "value 9:   int64: -34359738368\n"
                       "value 10:   uint64: 18446744073709551615\n"
                       "value 11:   double: 42.500000\n");
}

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

static void
message_serialize_complex (void)
{
  GError *error;
  GVariant *value;

  error = NULL;

  value = g_variant_parse (G_VARIANT_TYPE ("(aia{ss})"),
                           "([1, 2, 3], {'one': 'white', 'two': 'black'})",
                           NULL, NULL, &error);
  g_assert_no_error (error);
  g_assert (value != NULL);
  check_serialization (value,
                       "value 0:   array:\n"
                       "    int32: 1\n"
                       "    int32: 2\n"
                       "    int32: 3\n"
                       "value 1:   array:\n"
                       "    dict_entry:\n"
                       "      string: `one'\n"
                       "      string: `white'\n"
                       "    dict_entry:\n"
                       "      string: `two'\n"
                       "      string: `black'\n");

  value = g_variant_parse (G_VARIANT_TYPE ("(sa{sv}as)"),
                           "('01234567890123456', {}, ['Something'])",
                           NULL, NULL, &error);
  g_assert_no_error (error);
  g_assert (value != NULL);
  check_serialization (value,
                       "value 0:   string: `01234567890123456'\n"
                       "value 1:   array:\n"
                       "value 2:   array:\n"
                       "    string: `Something'\n");

  /* https://bugzilla.gnome.org/show_bug.cgi?id=621838 */
  check_serialization (g_variant_new_parsed ("(@aay [], {'cwd': <'/home/davidz/Hacking/glib/gio/tests'>})"),
                       "value 0:   array:\n"
                       "value 1:   array:\n"
                       "    dict_entry:\n"
                       "      string: `cwd'\n"
                       "      variant:\n"
                       "        string: `/home/davidz/Hacking/glib/gio/tests'\n");

#ifdef DBUS_TYPE_UNIX_FD
  value = g_variant_parse (G_VARIANT_TYPE ("(hah)"),
                           "(42, [43, 44])",
                           NULL, NULL, &error);
  g_assert_no_error (error);
  g_assert (value != NULL);
  /* about (not extracted), see comment in DBUS_TYPE_UNIX_FD case in
   * dbus_1_message_append() above.
   */
  check_serialization (value,
                       "value 0:   unix-fd: (not extracted)\n"
                       "value 1:   array:\n"
                       "    unix-fd: (not extracted)\n"
                       "    unix-fd: (not extracted)\n");
#endif
}


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

static void
replace (char       *blob,
         gsize       len,
	 const char *before,
	 const char *after)
{
  gsize i;
  gsize slen = strlen (before) + 1;

  g_assert_cmpuint (strlen (before), ==, strlen (after));
  g_assert_cmpuint (len, >=, slen);

  for (i = 0; i < (len - slen + 1); i++)
    {
      if (memcmp (blob + i, before, slen) == 0)
        memcpy (blob + i, after, slen);
    }
}

static void
message_serialize_invalid (void)
{
  guint n;

  /* Other things we could check (note that GDBus _does_ check for all
   * these things - we just don't have test-suit coverage for it)
   *
   *  - array exceeding 64 MiB (2^26 bytes) - unfortunately libdbus-1 checks
   *    this, e.g.
   *
   *      process 19620: arguments to dbus_message_iter_append_fixed_array() were incorrect,
   *      assertion "n_elements <= DBUS_MAXIMUM_ARRAY_LENGTH / _dbus_type_get_alignment (element_type)"
   *      failed in file dbus-message.c line 2344.
   *      This is normally a bug in some application using the D-Bus library.
   *      D-Bus not built with -rdynamic so unable to print a backtrace
   *      Aborted (core dumped)
   *
   *  - message exceeding 128 MiB (2^27 bytes)
   *
   *  - endianness, message type, flags, protocol version
   */

  for (n = 0; n < 3; n++)
    {
      GDBusMessage *message;
      GError *error;
      DBusMessage *dbus_message;
      char *blob;
      int blob_len;
      /* these are in pairs with matching length */
      const gchar *valid_utf8_str = "this is valid...";
      const gchar *invalid_utf8_str = "this is invalid\xff";
      const gchar *valid_signature = "a{sv}a{sv}a{sv}aiai";
      const gchar *invalid_signature = "not valid signature";
      const gchar *valid_object_path = "/this/is/a/valid/dbus/object/path";
      const gchar *invalid_object_path = "/this/is/not a valid object path!";

      dbus_message = dbus_message_new (DBUS_MESSAGE_TYPE_METHOD_CALL);
      dbus_message_set_serial (dbus_message, 0x41);
      dbus_message_set_path (dbus_message, "/foo/bar");
      dbus_message_set_member (dbus_message, "Member");
      switch (n)
        {
        case 0:
          /* invalid UTF-8 */
          dbus_message_append_args (dbus_message,
                                    DBUS_TYPE_STRING, &valid_utf8_str,
                                    DBUS_TYPE_INVALID);
          break;

        case 1:
          /* invalid object path */
          dbus_message_append_args (dbus_message,
                                    DBUS_TYPE_OBJECT_PATH, &valid_object_path,
                                    DBUS_TYPE_INVALID);
          break;

        case 2:
          /* invalid signature */
          dbus_message_append_args (dbus_message,
                                    DBUS_TYPE_SIGNATURE, &valid_signature,
                                    DBUS_TYPE_INVALID);
          break;

        default:
          g_assert_not_reached ();
          break;
        }
      dbus_message_marshal (dbus_message, &blob, &blob_len);
      /* hack up the message to be invalid by replacing each valid string
       * with its invalid counterpart */
      replace (blob, blob_len, valid_utf8_str, invalid_utf8_str);
      replace (blob, blob_len, valid_object_path, invalid_object_path);
      replace (blob, blob_len, valid_signature, invalid_signature);

      error = NULL;
      message = g_dbus_message_new_from_blob ((guchar *) blob,
                                              blob_len,
                                              G_DBUS_CAPABILITY_FLAGS_NONE,
                                              &error);
      g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
      g_error_free (error);
      g_assert (message == NULL);

      dbus_free (blob);
    }

}

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

static void
message_serialize_header_checks (void)
{
  GDBusMessage *message;
  GDBusMessage *reply;
  GError *error;
  guchar *blob;
  gsize blob_size;

  /*
   * check we can't serialize messages with INVALID type
   */
  message = g_dbus_message_new ();
  error = NULL;
  blob = g_dbus_message_to_blob (message, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: type is INVALID");
  g_error_free (error);
  g_assert (blob == NULL);
  g_object_unref (message);

  /*
   * check we can't serialize signal messages with INTERFACE, PATH or MEMBER unset / set to reserved value
   */
  message = g_dbus_message_new_signal ("/the/path", "The.Interface", "TheMember");
  /* ----- */
  /* interface NULL => error */
  g_dbus_message_set_interface (message, NULL);
  error = NULL;
  blob = g_dbus_message_to_blob (message, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: SIGNAL message: PATH, INTERFACE or MEMBER header field is missing");
  g_error_free (error);
  g_assert (blob == NULL);
  /* interface reserved value => error */
  g_dbus_message_set_interface (message, "org.freedesktop.DBus.Local");
  error = NULL;
  blob = g_dbus_message_to_blob (message, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: SIGNAL message: The INTERFACE header field is using the reserved value org.freedesktop.DBus.Local");
  g_error_free (error);
  g_assert (blob == NULL);
  /* reset interface */
  g_dbus_message_set_interface (message, "The.Interface");
  /* ----- */
  /* path NULL => error */
  g_dbus_message_set_path (message, NULL);
  error = NULL;
  blob = g_dbus_message_to_blob (message, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: SIGNAL message: PATH, INTERFACE or MEMBER header field is missing");
  g_error_free (error);
  g_assert (blob == NULL);
  /* path reserved value => error */
  g_dbus_message_set_path (message, "/org/freedesktop/DBus/Local");
  error = NULL;
  blob = g_dbus_message_to_blob (message, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: SIGNAL message: The PATH header field is using the reserved value /org/freedesktop/DBus/Local");
  g_error_free (error);
  g_assert (blob == NULL);
  /* reset path */
  g_dbus_message_set_path (message, "/the/path");
  /* ----- */
  /* member NULL => error */
  g_dbus_message_set_member (message, NULL);
  error = NULL;
  blob = g_dbus_message_to_blob (message, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: SIGNAL message: PATH, INTERFACE or MEMBER header field is missing");
  g_error_free (error);
  g_assert (blob == NULL);
  /* reset member */
  g_dbus_message_set_member (message, "TheMember");
  /* ----- */
  /* done */
  g_object_unref (message);

  /*
   * check that we can't serialize method call messages with PATH or MEMBER unset
   */
  message = g_dbus_message_new_method_call (NULL, "/the/path", NULL, "TheMember");
  /* ----- */
  /* path NULL => error */
  g_dbus_message_set_path (message, NULL);
  error = NULL;
  blob = g_dbus_message_to_blob (message, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: METHOD_CALL message: PATH or MEMBER header field is missing");
  g_error_free (error);
  g_assert (blob == NULL);
  /* reset path */
  g_dbus_message_set_path (message, "/the/path");
  /* ----- */
  /* member NULL => error */
  g_dbus_message_set_member (message, NULL);
  error = NULL;
  blob = g_dbus_message_to_blob (message, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: METHOD_CALL message: PATH or MEMBER header field is missing");
  g_error_free (error);
  g_assert (blob == NULL);
  /* reset member */
  g_dbus_message_set_member (message, "TheMember");
  /* ----- */
  /* done */
  g_object_unref (message);

  /*
   * check that we can't serialize method reply messages with REPLY_SERIAL unset
   */
  message = g_dbus_message_new_method_call (NULL, "/the/path", NULL, "TheMember");
  g_dbus_message_set_serial (message, 42);
  /* method reply */
  reply = g_dbus_message_new_method_reply (message);
  g_assert_cmpint (g_dbus_message_get_reply_serial (reply), ==, 42);
  g_dbus_message_set_header (reply, G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL, NULL);
  error = NULL;
  blob = g_dbus_message_to_blob (reply, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: METHOD_RETURN message: REPLY_SERIAL header field is missing");
  g_error_free (error);
  g_assert (blob == NULL);
  g_object_unref (reply);
  /* method error - first nuke ERROR_NAME, then REPLY_SERIAL */
  reply = g_dbus_message_new_method_error (message, "Some.Error.Name", "the message");
  g_assert_cmpint (g_dbus_message_get_reply_serial (reply), ==, 42);
  /* nuke ERROR_NAME */
  g_dbus_message_set_error_name (reply, NULL);
  error = NULL;
  blob = g_dbus_message_to_blob (reply, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: ERROR message: REPLY_SERIAL or ERROR_NAME header field is missing");
  g_error_free (error);
  g_assert (blob == NULL);
  /* reset ERROR_NAME */
  g_dbus_message_set_error_name (reply, "Some.Error.Name");
  /* nuke REPLY_SERIAL */
  g_dbus_message_set_header (reply, G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL, NULL);
  error = NULL;
  blob = g_dbus_message_to_blob (reply, &blob_size, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
  g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
  g_assert_cmpstr (error->message, ==, "Cannot serialize message: ERROR message: REPLY_SERIAL or ERROR_NAME header field is missing");
  g_error_free (error);
  g_assert (blob == NULL);
  g_object_unref (reply);
  g_object_unref (message);
}

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

int
main (int   argc,
      char *argv[])
{
  setlocale (LC_ALL, "C");

  g_type_init ();
  g_test_init (&argc, &argv, NULL);

  g_test_add_func ("/gdbus/message-serialize-basic", message_serialize_basic);
  g_test_add_func ("/gdbus/message-serialize-complex", message_serialize_complex);
  g_test_add_func ("/gdbus/message-serialize-invalid", message_serialize_invalid);
  g_test_add_func ("/gdbus/message-serialize-header-checks", message_serialize_header_checks);
  return g_test_run();
}