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glib/gio/gdbusmessage.c
David Zeuthen 79d32c2fc1 GDBusMessage: Fix bug when deserializing a message 
See https://bugzilla.gnome.org/show_bug.cgi?id=621838 for the whole
story. The problem was that we ended up reading data from arrays of
arrays when we were just supposed to be aligning the buffers.

Also add a host of debug infrastructure that was needed to find the
root cause. For now it can be turned on only via defining
DEBUG_SERIALIZER. In the future we might want to make it work via
G_DBUS_DEBUG. In a nutshell, the added debug info looks like this

Parsing blob (blob_len = 0x0084 bytes)
  0000: 6c 01 00 01  3c 00 00 00  41 00 00 00  37 00 00 00    l...<...A...7...
  0010: 08 01 67 00  08 61 61 79  61 7b 73 76  7d 00 00 00    ..g..aaya{sv}...
  0020: 01 01 6f 00  08 00 00 00  2f 66 6f 6f  2f 62 61 72    ..o...../foo/bar
  0030: 00 00 00 00  00 00 00 00  03 01 73 00  06 00 00 00    ..........s.....
  0040: 4d 65 6d 62  65 72 00 00  00 00 00 00  34 00 00 00    Member......4...
  0050: 03 00 00 00  63 77 64 00  01 73 00 00  23 00 00 00    ....cwd..s..#...
  0060: 2f 68 6f 6d  65 2f 64 61  76 69 64 7a  2f 48 61 63    /home/davidz/Hac
  0070: 6b 69 6e 67  2f 67 6c 69  62 2f 67 69  6f 2f 74 65    king/glib/gio/te
  0080: 73 74 73 00                                           sts.

Parsing headers (blob_len = 0x0084 bytes)
  Reading type a{yv} from offset 0x000c: array spans 0x0037 bytes
    Reading type {yv} from offset 0x0010
      Reading type y from offset 0x0010: 0x08 '
      Reading type v from offset 0x0011
        Reading type g from offset 0x0014: 'aaya{sv}'
    Reading type {yv} from offset 0x001e
      Reading type y from offset 0x0020: 0x01 ''
      Reading type v from offset 0x0021
        Reading type o from offset 0x0024: '/foo/bar'
    Reading type {yv} from offset 0x0031
      Reading type y from offset 0x0038: 0x03 ''
      Reading type v from offset 0x0039
        Reading type s from offset 0x003c: 'Member'
Parsing body (blob_len = 0x0084 bytes)
  Reading type (aaya{sv}) from offset 0x0047
    Reading type aay from offset 0x0048: array spans 0x0000 bytes
    Reading type a{sv} from offset 0x004c: array spans 0x0034 bytes
      Reading type {sv} from offset 0x0050
        Reading type s from offset 0x0050: 'cwd'
        Reading type v from offset 0x0058
          Reading type s from offset 0x005b: '/home/davidz/Hacking/glib/gio/tests'
OK

Signed-off-by: David Zeuthen <davidz@redhat.com>
2010-06-17 18:01:32 -04:00

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/* GDBus - GLib D-Bus Library
*
* 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>
*/
/* Uncomment to debug serializer code */
/* #define DEBUG_SERIALIZER */
#include "config.h"
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "gdbusutils.h"
#include "gdbusmessage.h"
#include "gdbuserror.h"
#include "gioenumtypes.h"
#include "ginputstream.h"
#include "gdatainputstream.h"
#include "gmemoryinputstream.h"
#include "goutputstream.h"
#include "gdataoutputstream.h"
#include "gmemoryoutputstream.h"
#include "gseekable.h"
#include "gioerror.h"
#include "gdbusprivate.h"
#ifdef G_OS_UNIX
#include "gunixfdlist.h"
#endif
#include "glibintl.h"
#include "gioalias.h"
/**
* SECTION:gdbusmessage
* @short_description: D-Bus Message
* @include: gio/gio.h
*
* A type for representing D-Bus messages that can be sent or received
* on a #GDBusConnection.
*/
struct _GDBusMessagePrivate
{
GDBusMessageType type;
GDBusMessageFlags flags;
guchar major_protocol_version;
guint32 serial;
GHashTable *headers;
GVariant *body;
#ifdef G_OS_UNIX
GUnixFDList *fd_list;
#endif
};
G_DEFINE_TYPE (GDBusMessage, g_dbus_message, G_TYPE_OBJECT);
static void
g_dbus_message_finalize (GObject *object)
{
GDBusMessage *message = G_DBUS_MESSAGE (object);
if (message->priv->headers != NULL)
g_hash_table_unref (message->priv->headers);
if (message->priv->body != NULL)
g_variant_unref (message->priv->body);
#ifdef G_OS_UNIX
if (message->priv->fd_list != NULL)
g_object_unref (message->priv->fd_list);
#endif
if (G_OBJECT_CLASS (g_dbus_message_parent_class)->finalize != NULL)
G_OBJECT_CLASS (g_dbus_message_parent_class)->finalize (object);
}
static void
g_dbus_message_class_init (GDBusMessageClass *klass)
{
GObjectClass *gobject_class;
g_type_class_add_private (klass, sizeof (GDBusMessagePrivate));
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_dbus_message_finalize;
}
static void
g_dbus_message_init (GDBusMessage *message)
{
message->priv = G_TYPE_INSTANCE_GET_PRIVATE (message, G_TYPE_DBUS_MESSAGE, GDBusMessagePrivate);
message->priv->headers = g_hash_table_new_full (g_direct_hash,
g_direct_equal,
NULL,
(GDestroyNotify) g_variant_unref);
}
/**
* g_dbus_message_new:
*
* Creates a new empty #GDBusMessage.
*
* Returns: A #GDBusMessage. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_new (void)
{
return g_object_new (G_TYPE_DBUS_MESSAGE, NULL);
}
/**
* g_dbus_message_new_method_call:
* @name: A valid D-Bus name or %NULL.
* @path: A valid object path.
* @interface_: A valid D-Bus interface name or %NULL.
* @method: A valid method name.
*
* Creates a new #GDBusMessage for a method call.
*
* Returns: A #GDBusMessage. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_new_method_call (const gchar *name,
const gchar *path,
const gchar *interface_,
const gchar *method)
{
GDBusMessage *message;
g_return_val_if_fail (name == NULL || g_dbus_is_name (name), NULL);
g_return_val_if_fail (g_variant_is_object_path (path), NULL);
g_return_val_if_fail (g_dbus_is_member_name (method), NULL);
g_return_val_if_fail (interface_ == NULL || g_dbus_is_interface_name (interface_), NULL);
message = g_dbus_message_new ();
message->priv->type = G_DBUS_MESSAGE_TYPE_METHOD_CALL;
if (name != NULL)
g_dbus_message_set_destination (message, name);
g_dbus_message_set_path (message, path);
g_dbus_message_set_member (message, method);
if (interface_ != NULL)
g_dbus_message_set_interface (message, interface_);
return message;
}
/**
* g_dbus_message_new_signal:
* @path: A valid object path.
* @interface_: A valid D-Bus interface name or %NULL.
* @signal: A valid signal name.
*
* Creates a new #GDBusMessage for a signal emission.
*
* Returns: A #GDBusMessage. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_new_signal (const gchar *path,
const gchar *interface_,
const gchar *signal)
{
GDBusMessage *message;
g_return_val_if_fail (g_variant_is_object_path (path), NULL);
g_return_val_if_fail (g_dbus_is_member_name (signal), NULL);
g_return_val_if_fail (interface_ == NULL || g_dbus_is_interface_name (interface_), NULL);
message = g_dbus_message_new ();
message->priv->type = G_DBUS_MESSAGE_TYPE_SIGNAL;
message->priv->flags = G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
g_dbus_message_set_path (message, path);
g_dbus_message_set_member (message, signal);
if (interface_ != NULL)
g_dbus_message_set_interface (message, interface_);
return message;
}
/**
* g_dbus_message_new_method_reply:
* @method_call_message: A message of type %G_DBUS_MESSAGE_TYPE_METHOD_CALL to
* create a reply message to.
*
* Creates a new #GDBusMessage that is a reply to @method_call_message.
*
* Returns: A #GDBusMessage. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_new_method_reply (GDBusMessage *method_call_message)
{
GDBusMessage *message;
const gchar *sender;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (method_call_message), NULL);
g_return_val_if_fail (g_dbus_message_get_message_type (method_call_message) == G_DBUS_MESSAGE_TYPE_METHOD_CALL, NULL);
g_return_val_if_fail (g_dbus_message_get_serial (method_call_message) != 0, NULL);
message = g_dbus_message_new ();
message->priv->type = G_DBUS_MESSAGE_TYPE_METHOD_RETURN;
message->priv->flags = G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
g_dbus_message_set_reply_serial (message, g_dbus_message_get_serial (method_call_message));
sender = g_dbus_message_get_sender (method_call_message);
if (sender != NULL)
g_dbus_message_set_destination (message, sender);
return message;
}
/**
* g_dbus_message_new_method_error:
* @method_call_message: A message of type %G_DBUS_MESSAGE_TYPE_METHOD_CALL to
* create a reply message to.
* @error_name: A valid D-Bus error name.
* @error_message_format: The D-Bus error message in a printf() format.
* @...: Arguments for @error_message_format.
*
* Creates a new #GDBusMessage that is an error reply to @method_call_message.
*
* Returns: A #GDBusMessage. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_new_method_error (GDBusMessage *method_call_message,
const gchar *error_name,
const gchar *error_message_format,
...)
{
GDBusMessage *ret;
va_list var_args;
va_start (var_args, error_message_format);
ret = g_dbus_message_new_method_error_valist (method_call_message,
error_name,
error_message_format,
var_args);
va_end (var_args);
return ret;
}
/**
* g_dbus_message_new_method_error_literal:
* @method_call_message: A message of type %G_DBUS_MESSAGE_TYPE_METHOD_CALL to
* create a reply message to.
* @error_name: A valid D-Bus error name.
* @error_message: The D-Bus error message.
*
* Creates a new #GDBusMessage that is an error reply to @method_call_message.
*
* Returns: A #GDBusMessage. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_new_method_error_literal (GDBusMessage *method_call_message,
const gchar *error_name,
const gchar *error_message)
{
GDBusMessage *message;
const gchar *sender;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (method_call_message), NULL);
g_return_val_if_fail (g_dbus_message_get_message_type (method_call_message) == G_DBUS_MESSAGE_TYPE_METHOD_CALL, NULL);
g_return_val_if_fail (g_dbus_message_get_serial (method_call_message) != 0, NULL);
g_return_val_if_fail (g_dbus_is_name (error_name), NULL);
g_return_val_if_fail (error_message != NULL, NULL);
message = g_dbus_message_new ();
message->priv->type = G_DBUS_MESSAGE_TYPE_ERROR;
message->priv->flags = G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
g_dbus_message_set_reply_serial (message, g_dbus_message_get_serial (method_call_message));
g_dbus_message_set_error_name (message, error_name);
g_dbus_message_set_body (message, g_variant_new ("(s)", error_message));
sender = g_dbus_message_get_sender (method_call_message);
if (sender != NULL)
g_dbus_message_set_destination (message, sender);
return message;
}
/**
* g_dbus_message_new_method_error_valist:
* @method_call_message: A message of type %G_DBUS_MESSAGE_TYPE_METHOD_CALL to
* create a reply message to.
* @error_name: A valid D-Bus error name.
* @error_message_format: The D-Bus error message in a printf() format.
* @var_args: Arguments for @error_message_format.
*
* Like g_dbus_message_new_method_error() but intended for language bindings.
*
* Returns: A #GDBusMessage. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_new_method_error_valist (GDBusMessage *method_call_message,
const gchar *error_name,
const gchar *error_message_format,
va_list var_args)
{
GDBusMessage *ret;
gchar *error_message;
error_message = g_strdup_vprintf (error_message_format, var_args);
ret = g_dbus_message_new_method_error_literal (method_call_message,
error_name,
error_message);
g_free (error_message);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/* TODO: need GI annotations to specify that any guchar value goes for the type */
/**
* g_dbus_message_get_message_type:
* @message: A #GDBusMessage.
*
* Gets the type of @message.
*
* Returns: A 8-bit unsigned integer (typically a value from the #GDBusMessageType enumeration).
*
* Since: 2.26
*/
GDBusMessageType
g_dbus_message_get_message_type (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), G_DBUS_MESSAGE_TYPE_INVALID);
return message->priv->type;
}
/**
* g_dbus_message_set_message_type:
* @message: A #GDBusMessage.
* @type: A 8-bit unsigned integer (typically a value from the #GDBusMessageType enumeration).
*
* Sets @message to be of @type.
*
* Since: 2.26
*/
void
g_dbus_message_set_message_type (GDBusMessage *message,
GDBusMessageType type)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (type >=0 && type < 256);
message->priv->type = type;
}
/* ---------------------------------------------------------------------------------------------------- */
/* TODO: need GI annotations to specify that any guchar value goes for flags */
/**
* g_dbus_message_get_flags:
* @message: A #GDBusMessage.
*
* Gets the flags for @message.
*
* Returns: Flags that are set (typically values from the #GDBusMessageFlags enumeration bitwise ORed together).
*
* Since: 2.26
*/
GDBusMessageFlags
g_dbus_message_get_flags (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), G_DBUS_MESSAGE_FLAGS_NONE);
return message->priv->flags;
}
/**
* g_dbus_message_set_flags:
* @message: A #GDBusMessage.
* @flags: Flags for @message that are set (typically values from the #GDBusMessageFlags
* enumeration bitwise ORed together).
*
* Sets the flags to set on @message.
*
* Since: 2.26
*/
void
g_dbus_message_set_flags (GDBusMessage *message,
GDBusMessageFlags flags)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (flags >=0 && flags < 256);
message->priv->flags = flags;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_serial:
* @message: A #GDBusMessage.
*
* Gets the serial for @message.
*
* Returns: A #guint32.
*
* Since: 2.26
*/
guint32
g_dbus_message_get_serial (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), 0);
return message->priv->serial;
}
/**
* g_dbus_message_set_serial:
* @message: A #GDBusMessage.
* @serial: A #guint32.
*
* Sets the serial for @message.
*
* Since: 2.26
*/
void
g_dbus_message_set_serial (GDBusMessage *message,
guint32 serial)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
message->priv->serial = serial;
}
/* ---------------------------------------------------------------------------------------------------- */
/* TODO: need GI annotations to specify that any guchar value goes for header_field */
/**
* g_dbus_message_get_header:
* @message: A #GDBusMessage.
* @header_field: A 8-bit unsigned integer (typically a value from the #GDBusMessageHeaderField enumeration)
*
* Gets a header field on @message.
*
* Returns: A #GVariant with the value if the header was found, %NULL
* otherwise. Do not free, it is owned by @message.
*
* Since: 2.26
*/
GVariant *
g_dbus_message_get_header (GDBusMessage *message,
GDBusMessageHeaderField header_field)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
g_return_val_if_fail (header_field >=0 && header_field < 256, NULL);
return g_hash_table_lookup (message->priv->headers, GUINT_TO_POINTER (header_field));
}
/**
* g_dbus_message_set_header:
* @message: A #GDBusMessage.
* @header_field: A 8-bit unsigned integer (typically a value from the #GDBusMessageHeaderField enumeration)
* @value: A #GVariant to set the header field or %NULL to clear the header field.
*
* Sets a header field on @message.
*
* If @value is floating, @message assumes ownership of @value.
*
* Since: 2.26
*/
void
g_dbus_message_set_header (GDBusMessage *message,
GDBusMessageHeaderField header_field,
GVariant *value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (header_field >=0 && header_field < 256);
if (value == NULL)
{
g_hash_table_remove (message->priv->headers, GUINT_TO_POINTER (header_field));
}
else
{
g_hash_table_insert (message->priv->headers, GUINT_TO_POINTER (header_field), g_variant_ref_sink (value));
}
}
/**
* g_dbus_message_get_header_fields:
* @message: A #GDBusMessage.
*
* Gets an array of all header fields on @message that are set.
*
* Returns: An array of header fields terminated by
* %G_DBUS_MESSAGE_HEADER_FIELD_INVALID. Each element is a
* #guchar. Free with g_free().
*
* Since: 2.26
*/
guchar *
g_dbus_message_get_header_fields (GDBusMessage *message)
{
GList *keys;
guchar *ret;
guint num_keys;
GList *l;
guint n;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
keys = g_hash_table_get_keys (message->priv->headers);
num_keys = g_list_length (keys);
ret = g_new (guchar, num_keys + 1);
for (l = keys, n = 0; l != NULL; l = l->next, n++)
ret[n] = GPOINTER_TO_UINT (l->data);
g_assert (n == num_keys);
ret[n] = G_DBUS_MESSAGE_HEADER_FIELD_INVALID;
g_list_free (keys);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_body:
* @message: A #GDBusMessage.
*
* Gets the body of a message.
*
* Returns: A #GVariant or %NULL if the body is empty. Do not free, it is owned by @message.
*
* Since: 2.26
*/
GVariant *
g_dbus_message_get_body (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
return message->priv->body;
}
/**
* g_dbus_message_set_body:
* @message: A #GDBusMessage.
* @body: Either %NULL or a #GVariant that is a tuple.
*
* Sets the body @message. As a side-effect the
* %G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE header field is set to the
* type string of @body (or cleared if @body is %NULL).
*
* If @body is floating, @message assumes ownership of @body.
*
* Since: 2.26
*/
void
g_dbus_message_set_body (GDBusMessage *message,
GVariant *body)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail ((body == NULL) || g_variant_is_of_type (body, G_VARIANT_TYPE_TUPLE));
if (message->priv->body != NULL)
g_variant_unref (message->priv->body);
if (body == NULL)
{
message->priv->body = NULL;
g_dbus_message_set_signature (message, NULL);
}
else
{
const gchar *type_string;
gsize type_string_len;
gchar *signature;
message->priv->body = g_variant_ref_sink (body);
type_string = g_variant_get_type_string (body);
type_string_len = strlen (type_string);
g_assert (type_string_len >= 2);
signature = g_strndup (type_string + 1, type_string_len - 2);
g_dbus_message_set_signature (message, signature);
g_free (signature);
}
}
/* ---------------------------------------------------------------------------------------------------- */
#ifdef G_OS_UNIX
/**
* g_dbus_message_get_unix_fd_list:
* @message: A #GDBusMessage.
*
* Gets the UNIX file descriptors associated with @message, if any.
*
* This method is only available on UNIX.
*
* Returns: A #GUnixFDList or %NULL if no file descriptors are
* associated. Do not free, this object is owned by @message.
*
* Since: 2.26
*/
GUnixFDList *
g_dbus_message_get_unix_fd_list (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
return message->priv->fd_list;
}
/**
* g_dbus_message_set_unix_fd_list:
* @message: A #GDBusMessage.
* @fd_list: A #GUnixFDList or %NULL.
*
* Sets the UNIX file descriptors associated with @message. As a
* side-effect the %G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS header
* field is set to the number of fds in @fd_list (or cleared if
* @fd_list is %NULL).
*
* This method is only available on UNIX.
*
* Since: 2.26
*/
void
g_dbus_message_set_unix_fd_list (GDBusMessage *message,
GUnixFDList *fd_list)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (fd_list == NULL || G_IS_UNIX_FD_LIST (fd_list));
if (message->priv->fd_list != NULL)
g_object_unref (message->priv->fd_list);
if (fd_list != NULL)
{
message->priv->fd_list = g_object_ref (fd_list);
g_dbus_message_set_num_unix_fds (message, g_unix_fd_list_get_length (fd_list));
}
else
{
message->priv->fd_list = NULL;
g_dbus_message_set_num_unix_fds (message, 0);
}
}
#endif
/* ---------------------------------------------------------------------------------------------------- */
static gboolean
ensure_input_padding (GMemoryInputStream *mis,
gsize padding_size,
GError **error)
{
gsize offset;
gsize wanted_offset;
offset = g_seekable_tell (G_SEEKABLE (mis));
wanted_offset = ((offset + padding_size - 1) / padding_size) * padding_size;
if (offset != wanted_offset)
{
return g_seekable_seek (G_SEEKABLE (mis), wanted_offset, G_SEEK_SET, NULL, error);
}
else
{
return TRUE;
}
}
static gchar *
read_string (GMemoryInputStream *mis,
GDataInputStream *dis,
gsize len,
GError **error)
{
GString *s;
gchar buf[256];
gsize remaining;
guchar nul;
GError *local_error;
s = g_string_new (NULL);
remaining = len;
while (remaining > 0)
{
gsize to_read;
gssize num_read;
to_read = MIN (remaining, sizeof (buf));
num_read = g_input_stream_read (G_INPUT_STREAM (mis),
buf,
to_read,
NULL,
error);
if (num_read < 0)
goto fail;
if (num_read == 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Wanted to read %" G_GSIZE_FORMAT " bytes but got EOF"),
to_read);
goto fail;
}
remaining -= num_read;
g_string_append_len (s, buf, num_read);
}
local_error = NULL;
nul = g_data_input_stream_read_byte (dis, NULL, &local_error);
if (local_error != NULL)
{
g_propagate_error (error, local_error);
goto fail;
}
if (nul != '\0')
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Expected NUL byte after the string `%s' but found `%c' (%d)"),
s->str, nul, nul);
goto fail;
}
return g_string_free (s, FALSE);
fail:
g_string_free (s, TRUE);
return NULL;
}
/* if just_align==TRUE, don't read a value, just align the input stream wrt padding */
static GVariant *
parse_value_from_blob (GMemoryInputStream *mis,
GDataInputStream *dis,
const GVariantType *type,
gboolean just_align,
guint indent,
GError **error)
{
GVariant *ret;
GError *local_error;
gboolean is_leaf;
#ifdef DEBUG_SERIALIZER
if (!just_align)
{
gchar *s;
s = g_variant_type_dup_string (type);
g_print ("%*sReading type %s from offset 0x%04x",
indent, "",
s,
(gint) g_seekable_tell (G_SEEKABLE (mis)));
g_free (s);
}
#endif /* DEBUG_SERIALIZER */
ret = NULL;
is_leaf = TRUE;
local_error = NULL;
if (g_variant_type_equal (type, G_VARIANT_TYPE_BOOLEAN))
{
if (!ensure_input_padding (mis, 4, &local_error))
goto fail;
if (!just_align)
{
gboolean v;
v = g_data_input_stream_read_uint32 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
ret = g_variant_new_boolean (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_BYTE))
{
if (!just_align)
{
guchar v;
v = g_data_input_stream_read_byte (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
ret = g_variant_new_byte (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT16))
{
if (!ensure_input_padding (mis, 2, &local_error))
goto fail;
if (!just_align)
{
gint16 v;
v = g_data_input_stream_read_int16 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
ret = g_variant_new_int16 (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT16))
{
if (!ensure_input_padding (mis, 2, &local_error))
goto fail;
if (!just_align)
{
guint16 v;
v = g_data_input_stream_read_uint16 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
ret = g_variant_new_uint16 (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT32))
{
if (!ensure_input_padding (mis, 4, &local_error))
goto fail;
if (!just_align)
{
gint32 v;
v = g_data_input_stream_read_int32 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
ret = g_variant_new_int32 (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT32))
{
if (!ensure_input_padding (mis, 4, &local_error))
goto fail;
if (!just_align)
{
guint32 v;
v = g_data_input_stream_read_uint32 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
ret = g_variant_new_uint32 (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT64))
{
if (!ensure_input_padding (mis, 8, &local_error))
goto fail;
if (!just_align)
{
gint64 v;
v = g_data_input_stream_read_int64 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
ret = g_variant_new_int64 (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT64))
{
if (!ensure_input_padding (mis, 8, &local_error))
goto fail;
if (!just_align)
{
guint64 v;
v = g_data_input_stream_read_uint64 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
ret = g_variant_new_uint64 (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_DOUBLE))
{
if (!ensure_input_padding (mis, 8, &local_error))
goto fail;
if (!just_align)
{
guint64 v;
gdouble *encoded;
v = g_data_input_stream_read_uint64 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
/* TODO: hmm */
encoded = (gdouble *) &v;
ret = g_variant_new_double (*encoded);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_STRING))
{
if (!ensure_input_padding (mis, 4, &local_error))
goto fail;
if (!just_align)
{
guint32 len;
gchar *v;
len = g_data_input_stream_read_uint32 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
v = read_string (mis, dis, (gsize) len, &local_error);
if (v == NULL)
goto fail;
ret = g_variant_new_string (v);
g_free (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_OBJECT_PATH))
{
if (!ensure_input_padding (mis, 4, &local_error))
goto fail;
if (!just_align)
{
guint32 len;
gchar *v;
len = g_data_input_stream_read_uint32 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
v = read_string (mis, dis, (gsize) len, &local_error);
if (v == NULL)
goto fail;
if (!g_variant_is_object_path (v))
{
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Parsed value `%s' is not a valid D-Bus object path"),
v);
g_free (v);
goto fail;
}
ret = g_variant_new_object_path (v);
g_free (v);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_SIGNATURE))
{
if (!just_align)
{
guchar len;
gchar *v;
len = g_data_input_stream_read_byte (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
v = read_string (mis, dis, (gsize) len, &local_error);
if (v == NULL)
goto fail;
if (!g_variant_is_signature (v))
{
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Parsed value `%s' is not a valid D-Bus signature"),
v);
g_free (v);
goto fail;
}
ret = g_variant_new_signature (v);
g_free (v);
}
}
else if (g_variant_type_is_array (type))
{
guint32 array_len;
goffset offset;
goffset target;
const GVariantType *element_type;
GVariantBuilder builder;
if (!ensure_input_padding (mis, 4, &local_error))
goto fail;
if (just_align)
{
array_len = 0;
}
else
{
array_len = g_data_input_stream_read_uint32 (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
is_leaf = FALSE;
#ifdef DEBUG_SERIALIZER
g_print (": array spans 0x%04x bytes\n", array_len);
#endif /* DEBUG_SERIALIZER */
if (array_len > (2<<26))
{
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Encountered array of length %" G_GUINT32_FORMAT " bytes. Maximum length is 2<<26 bytes."),
array_len);
goto fail;
}
}
g_variant_builder_init (&builder, type);
element_type = g_variant_type_element (type);
if (array_len == 0)
{
GVariant *item;
item = parse_value_from_blob (mis,
dis,
element_type,
TRUE,
indent + 2,
&local_error);
g_assert (item == NULL);
}
else
{
/* TODO: optimize array of primitive types */
offset = g_seekable_tell (G_SEEKABLE (mis));
target = offset + array_len;
while (offset < target)
{
GVariant *item;
item = parse_value_from_blob (mis,
dis,
element_type,
FALSE,
indent + 2,
&local_error);
if (item == NULL)
{
g_variant_builder_clear (&builder);
goto fail;
}
g_variant_builder_add_value (&builder, item);
offset = g_seekable_tell (G_SEEKABLE (mis));
}
}
if (!just_align)
{
ret = g_variant_builder_end (&builder);
}
else
{
g_variant_builder_clear (&builder);
}
}
else if (g_variant_type_is_dict_entry (type))
{
const GVariantType *key_type;
const GVariantType *value_type;
GVariant *key;
GVariant *value;
if (!ensure_input_padding (mis, 8, &local_error))
goto fail;
is_leaf = FALSE;
#ifdef DEBUG_SERIALIZER
g_print ("\n");
#endif /* DEBUG_SERIALIZER */
if (!just_align)
{
key_type = g_variant_type_key (type);
key = parse_value_from_blob (mis,
dis,
key_type,
FALSE,
indent + 2,
&local_error);
if (key == NULL)
goto fail;
value_type = g_variant_type_value (type);
value = parse_value_from_blob (mis,
dis,
value_type,
FALSE,
indent + 2,
&local_error);
if (value == NULL)
{
g_variant_unref (key);
goto fail;
}
ret = g_variant_new_dict_entry (key, value);
}
}
else if (g_variant_type_is_tuple (type))
{
if (!ensure_input_padding (mis, 8, &local_error))
goto fail;
is_leaf = FALSE;
#ifdef DEBUG_SERIALIZER
g_print ("\n");
#endif /* DEBUG_SERIALIZER */
if (!just_align)
{
const GVariantType *element_type;
GVariantBuilder builder;
g_variant_builder_init (&builder, type);
element_type = g_variant_type_first (type);
while (element_type != NULL)
{
GVariant *item;
item = parse_value_from_blob (mis,
dis,
element_type,
FALSE,
indent + 2,
&local_error);
if (item == NULL)
{
g_variant_builder_clear (&builder);
goto fail;
}
g_variant_builder_add_value (&builder, item);
element_type = g_variant_type_next (element_type);
}
ret = g_variant_builder_end (&builder);
}
}
else if (g_variant_type_is_variant (type))
{
is_leaf = FALSE;
#ifdef DEBUG_SERIALIZER
g_print ("\n");
#endif /* DEBUG_SERIALIZER */
if (!just_align)
{
guchar siglen;
gchar *sig;
GVariantType *variant_type;
GVariant *value;
siglen = g_data_input_stream_read_byte (dis, NULL, &local_error);
if (local_error != NULL)
goto fail;
sig = read_string (mis, dis, (gsize) siglen, &local_error);
if (sig == NULL)
goto fail;
if (!g_variant_is_signature (sig))
{
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Parsed value `%s' for variant is not a valid D-Bus signature"),
sig);
g_free (sig);
goto fail;
}
variant_type = g_variant_type_new (sig);
g_free (sig);
value = parse_value_from_blob (mis,
dis,
variant_type,
FALSE,
indent + 2,
&local_error);
g_variant_type_free (variant_type);
if (value == NULL)
goto fail;
ret = g_variant_new_variant (value);
}
}
else
{
gchar *s;
s = g_variant_type_dup_string (type);
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Error deserializing GVariant with type-string `%s' from the D-Bus wire format"),
s);
g_free (s);
goto fail;
}
g_assert ((just_align && ret == NULL) || (!just_align && ret != NULL));
#ifdef DEBUG_SERIALIZER
if (ret != NULL)
{
if (is_leaf)
{
gchar *s;
if (g_variant_type_equal (type, G_VARIANT_TYPE_BYTE))
{
s = g_strdup_printf ("0x%02x '%c'", g_variant_get_byte (ret), g_variant_get_byte (ret));
}
else
{
s = g_variant_print (ret, FALSE);
}
g_print (": %s\n", s);
g_free (s);
}
}
#endif /* DEBUG_SERIALIZER */
return ret;
fail:
#ifdef DEBUG_SERIALIZER
g_print ("\n"
"%*sFAILURE: %s (%s, %d)\n",
indent, "",
local_error->message,
g_quark_to_string (local_error->domain),
local_error->code);
#endif /* DEBUG_SERIALIZER */
g_propagate_error (error, local_error);
return NULL;
}
/* ---------------------------------------------------------------------------------------------------- */
/* message_header must be at least 16 bytes */
/**
* g_dbus_message_bytes_needed:
* @blob: A blob represent a binary D-Bus message.
* @blob_len: The length of @blob (must be at least 16).
* @error: Return location for error or %NULL.
*
* Utility function to calculate how many bytes are needed to
* completely deserialize the D-Bus message stored at @blob.
*
* Returns: Number of bytes needed or -1 if @error is set (e.g. if
* @blob contains invalid data or not enough data is available to
* determine the size).
*
* Since: 2.26
*/
gssize
g_dbus_message_bytes_needed (guchar *blob,
gsize blob_len,
GError **error)
{
gssize ret;
ret = -1;
g_return_val_if_fail (blob != NULL, -1);
g_return_val_if_fail (error == NULL || *error == NULL, -1);
g_return_val_if_fail (blob_len >= 16, -1);
if (blob[0] == 'l')
{
/* core header (12 bytes) + ARRAY of STRUCT of (BYTE,VARIANT) */
ret = 12 + 4 + GUINT32_FROM_LE (((guint32 *) blob)[3]);
/* round up so it's a multiple of 8 */
ret = 8 * ((ret + 7)/8);
/* finally add the body size */
ret += GUINT32_FROM_LE (((guint32 *) blob)[1]);
}
else if (blob[0] == 'B')
{
/* core header (12 bytes) + ARRAY of STRUCT of (BYTE,VARIANT) */
ret = 12 + 4 + GUINT32_FROM_BE (((guint32 *) blob)[3]);
/* round up so it's a multiple of 8 */
ret = 8 * ((ret + 7)/8);
/* finally add the body size */
ret += GUINT32_FROM_BE (((guint32 *) blob)[1]);
}
else
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Unable to determine message blob length - given blob is malformed");
}
if (ret > (2<<27))
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Blob indicates that message exceeds maximum message length (128MiB)");
ret = -1;
}
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_new_from_blob:
* @blob: A blob represent a binary D-Bus message.
* @blob_len: The length of @blob.
* @capabilities: A #GDBusCapabilityFlags describing what protocol features are supported.
* @error: Return location for error or %NULL.
*
* Creates a new #GDBusMessage from the data stored at @blob.
*
* Returns: A new #GDBusMessage or %NULL if @error is set. Free with
* g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_new_from_blob (guchar *blob,
gsize blob_len,
GDBusCapabilityFlags capabilities,
GError **error)
{
gboolean ret;
GMemoryInputStream *mis;
GDataInputStream *dis;
GDBusMessage *message;
guchar endianness;
guchar major_protocol_version;
GDataStreamByteOrder byte_order;
guint32 message_body_len;
GVariant *headers;
GVariant *item;
GVariantIter iter;
GVariant *signature;
/* TODO: check against @capabilities */
ret = FALSE;
g_return_val_if_fail (blob != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
g_return_val_if_fail (blob_len >= 12, NULL);
message = g_dbus_message_new ();
mis = G_MEMORY_INPUT_STREAM (g_memory_input_stream_new_from_data (blob, blob_len, NULL));
dis = g_data_input_stream_new (G_INPUT_STREAM (mis));
endianness = g_data_input_stream_read_byte (dis, NULL, NULL);
switch (endianness)
{
case 'l':
byte_order = G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN;
break;
case 'B':
byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
break;
default:
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Invalid endianness value. Expected 'l' or 'B' but found '%c' (%d)"),
endianness, endianness);
goto out;
}
g_data_input_stream_set_byte_order (dis, byte_order);
message->priv->type = g_data_input_stream_read_byte (dis, NULL, NULL);
message->priv->flags = g_data_input_stream_read_byte (dis, NULL, NULL);
major_protocol_version = g_data_input_stream_read_byte (dis, NULL, NULL);
if (major_protocol_version != 1)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Invalid major protocol version. Expected 1 but found %d"),
major_protocol_version);
goto out;
}
message_body_len = g_data_input_stream_read_uint32 (dis, NULL, NULL);
message->priv->serial = g_data_input_stream_read_uint32 (dis, NULL, NULL);
#ifdef DEBUG_SERIALIZER
g_print ("Parsing blob (blob_len = 0x%04x bytes)\n", (gint) blob_len);
{
gchar *s;
s = _g_dbus_hexdump ((const gchar *) blob, blob_len, 2);
g_print ("%s\n", s);
g_free (s);
}
#endif /* DEBUG_SERIALIZER */
#ifdef DEBUG_SERIALIZER
g_print ("Parsing headers (blob_len = 0x%04x bytes)\n", (gint) blob_len);
#endif /* DEBUG_SERIALIZER */
headers = parse_value_from_blob (mis,
dis,
G_VARIANT_TYPE ("a{yv}"),
FALSE,
2,
error);
if (headers == NULL)
goto out;
g_variant_ref_sink (headers);
g_variant_iter_init (&iter, headers);
while ((item = g_variant_iter_next_value (&iter)))
{
guchar header_field;
GVariant *value;
g_variant_get (item,
"{yv}",
&header_field,
&value);
g_dbus_message_set_header (message, header_field, value);
}
g_variant_unref (headers);
signature = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE);
if (signature != NULL)
{
const gchar *signature_str;
gsize signature_str_len;
signature_str = g_variant_get_string (signature, &signature_str_len);
/* signature but no body */
if (message_body_len == 0 && signature_str_len > 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Signature header with signature `%s' found but message body is empty"),
signature_str);
goto out;
}
else if (signature_str_len > 0)
{
GVariantType *variant_type;
gchar *tupled_signature_str;
if (!g_variant_is_signature (signature_str))
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Parsed value `%s' is not a valid D-Bus signature (for body)"),
signature_str);
goto out;
}
tupled_signature_str = g_strdup_printf ("(%s)", signature_str);
variant_type = g_variant_type_new (tupled_signature_str);
g_free (tupled_signature_str);
#ifdef DEBUG_SERIALIZER
g_print ("Parsing body (blob_len = 0x%04x bytes)\n", (gint) blob_len);
#endif /* DEBUG_SERIALIZER */
message->priv->body = parse_value_from_blob (mis,
dis,
variant_type,
FALSE,
2,
error);
if (message->priv->body == NULL)
{
g_variant_type_free (variant_type);
goto out;
}
g_variant_ref_sink (message->priv->body);
g_variant_type_free (variant_type);
}
}
else
{
/* no signature, this is only OK if the body is empty */
if (message_body_len != 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("No signature header in message but the message body is %" G_GUINT32_FORMAT " bytes"),
message_body_len);
goto out;
}
}
ret = TRUE;
out:
g_object_unref (dis);
g_object_unref (mis);
if (ret)
{
return message;
}
else
{
if (message != NULL)
g_object_unref (message);
return NULL;
}
}
/* ---------------------------------------------------------------------------------------------------- */
static gsize
ensure_output_padding (GMemoryOutputStream *mos,
GDataOutputStream *dos,
gsize padding_size)
{
gsize offset;
gsize wanted_offset;
gsize padding_needed;
guint n;
offset = g_memory_output_stream_get_data_size (mos);
wanted_offset = ((offset + padding_size - 1) / padding_size) * padding_size;
padding_needed = wanted_offset - offset;
for (n = 0; n < padding_needed; n++)
g_data_output_stream_put_byte (dos, '\0', NULL, NULL);
return padding_needed;
}
/* note that value can be NULL for e.g. empty arrays - type is never NULL */
static gboolean
append_value_to_blob (GVariant *value,
const GVariantType *type,
GMemoryOutputStream *mos,
GDataOutputStream *dos,
gsize *out_padding_added,
GError **error)
{
gsize padding_added;
padding_added = 0;
if (g_variant_type_equal (type, G_VARIANT_TYPE_BOOLEAN))
{
padding_added = ensure_output_padding (mos, dos, 4);
if (value != NULL)
{
gboolean v = g_variant_get_boolean (value);
g_data_output_stream_put_uint32 (dos, v, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_BYTE))
{
if (value != NULL)
{
guint8 v = g_variant_get_byte (value);
g_data_output_stream_put_byte (dos, v, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT16))
{
padding_added = ensure_output_padding (mos, dos, 2);
if (value != NULL)
{
gint16 v = g_variant_get_int16 (value);
g_data_output_stream_put_int16 (dos, v, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT16))
{
padding_added = ensure_output_padding (mos, dos, 2);
if (value != NULL)
{
guint16 v = g_variant_get_uint16 (value);
g_data_output_stream_put_uint16 (dos, v, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT32))
{
padding_added = ensure_output_padding (mos, dos, 4);
if (value != NULL)
{
gint32 v = g_variant_get_int32 (value);
g_data_output_stream_put_int32 (dos, v, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT32))
{
padding_added = ensure_output_padding (mos, dos, 4);
if (value != NULL)
{
guint32 v = g_variant_get_uint32 (value);
g_data_output_stream_put_uint32 (dos, v, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_INT64))
{
padding_added = ensure_output_padding (mos, dos, 8);
if (value != NULL)
{
gint64 v = g_variant_get_int64 (value);
g_data_output_stream_put_int64 (dos, v, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_UINT64))
{
padding_added = ensure_output_padding (mos, dos, 8);
if (value != NULL)
{
guint64 v = g_variant_get_uint64 (value);
g_data_output_stream_put_uint64 (dos, v, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_DOUBLE))
{
padding_added = ensure_output_padding (mos, dos, 8);
if (value != NULL)
{
guint64 *encoded;
gdouble v = g_variant_get_double (value);
/* TODO: hmm */
encoded = (guint64 *) &v;
g_data_output_stream_put_uint64 (dos, *encoded, NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_STRING))
{
padding_added = ensure_output_padding (mos, dos, 4);
if (value != NULL)
{
gsize len;
const gchar *v = g_variant_get_string (value, &len);
g_data_output_stream_put_uint32 (dos, len, NULL, NULL);
g_data_output_stream_put_string (dos, v, NULL, NULL);
g_data_output_stream_put_byte (dos, '\0', NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_OBJECT_PATH))
{
padding_added = ensure_output_padding (mos, dos, 4);
if (value != NULL)
{
/* TODO: validate object path */
gsize len;
const gchar *v = g_variant_get_string (value, &len);
g_data_output_stream_put_uint32 (dos, len, NULL, NULL);
g_data_output_stream_put_string (dos, v, NULL, NULL);
g_data_output_stream_put_byte (dos, '\0', NULL, NULL);
}
}
else if (g_variant_type_equal (type, G_VARIANT_TYPE_SIGNATURE))
{
if (value != NULL)
{
/* TODO: validate signature (including max len being 255) */
gsize len;
const gchar *v = g_variant_get_string (value, &len);
g_data_output_stream_put_byte (dos, len, NULL, NULL);
g_data_output_stream_put_string (dos, v, NULL, NULL);
g_data_output_stream_put_byte (dos, '\0', NULL, NULL);
}
}
else if (g_variant_type_is_array (type))
{
GVariant *item;
GVariantIter iter;
goffset array_len_offset;
goffset array_payload_begin_offset;
goffset cur_offset;
gsize array_len;
padding_added = ensure_output_padding (mos, dos, 4);
if (value != NULL)
{
/* array length - will be filled in later */
array_len_offset = g_memory_output_stream_get_data_size (mos);
g_data_output_stream_put_uint32 (dos, 0xF00DFACE, NULL, NULL);
/* From the D-Bus spec:
*
* "A UINT32 giving the length of the array data in bytes,
* followed by alignment padding to the alignment boundary of
* the array element type, followed by each array element. The
* array length is from the end of the alignment padding to
* the end of the last element, i.e. it does not include the
* padding after the length, or any padding after the last
* element."
*
* Thus, we need to count how much padding the first element
* contributes and subtract that from the array length.
*/
array_payload_begin_offset = g_memory_output_stream_get_data_size (mos);
if (g_variant_n_children (value) == 0)
{
gsize padding_added_for_item;
if (!append_value_to_blob (NULL,
g_variant_type_element (type),
mos,
dos,
&padding_added_for_item,
error))
goto fail;
array_payload_begin_offset += padding_added_for_item;
}
else
{
guint n;
n = 0;
g_variant_iter_init (&iter, value);
while ((item = g_variant_iter_next_value (&iter)))
{
gsize padding_added_for_item;
if (!append_value_to_blob (item,
g_variant_get_type (item),
mos,
dos,
&padding_added_for_item,
error))
goto fail;
if (n == 0)
{
array_payload_begin_offset += padding_added_for_item;
}
n++;
}
}
cur_offset = g_memory_output_stream_get_data_size (mos);
array_len = cur_offset - array_payload_begin_offset;
if (!g_seekable_seek (G_SEEKABLE (mos), array_len_offset, G_SEEK_SET, NULL, error))
goto fail;
g_data_output_stream_put_uint32 (dos, array_len, NULL, NULL);
if (!g_seekable_seek (G_SEEKABLE (mos), cur_offset, G_SEEK_SET, NULL, error))
goto fail;
}
}
else if (g_variant_type_is_dict_entry (type) || g_variant_type_is_tuple (type))
{
padding_added = ensure_output_padding (mos, dos, 8);
if (value != NULL)
{
GVariant *item;
GVariantIter iter;
g_variant_iter_init (&iter, value);
while ((item = g_variant_iter_next_value (&iter)))
{
if (!append_value_to_blob (item,
g_variant_get_type (item),
mos,
dos,
NULL,
error))
goto fail;
}
}
}
else if (g_variant_type_is_variant (type))
{
if (value != NULL)
{
GVariant *child;
const gchar *signature;
child = g_variant_get_child_value (value, 0);
signature = g_variant_get_type_string (child);
/* TODO: validate signature (including max len being 255) */
g_data_output_stream_put_byte (dos, strlen (signature), NULL, NULL);
g_data_output_stream_put_string (dos, signature, NULL, NULL);
g_data_output_stream_put_byte (dos, '\0', NULL, NULL);
if (!append_value_to_blob (child,
g_variant_get_type (child),
mos,
dos,
NULL,
error))
{
g_variant_unref (child);
goto fail;
}
g_variant_unref (child);
}
}
else
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Error serializing GVariant with type-string `%s' to the D-Bus wire format"),
g_variant_get_type_string (value));
goto fail;
}
if (out_padding_added != NULL)
*out_padding_added = padding_added;
return TRUE;
fail:
return FALSE;
}
static gboolean
append_body_to_blob (GVariant *value,
GMemoryOutputStream *mos,
GDataOutputStream *dos,
GError **error)
{
gboolean ret;
GVariant *item;
GVariantIter iter;
ret = FALSE;
if (!g_variant_is_of_type (value, G_VARIANT_TYPE_TUPLE))
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Expected a tuple for the body of the GDBusMessage.");
goto fail;
}
g_variant_iter_init (&iter, value);
while ((item = g_variant_iter_next_value (&iter)))
{
if (!append_value_to_blob (item,
g_variant_get_type (item),
mos,
dos,
NULL,
error))
goto fail;
}
return TRUE;
fail:
return FALSE;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_to_blob:
* @message: A #GDBusMessage.
* @out_size: Return location for size of generated blob.
* @capabilities: A #GDBusCapabilityFlags describing what protocol features are supported.
* @error: Return location for error.
*
* Serializes @message to a blob.
*
* Returns: A pointer to a valid binary D-Bus message of @out_size bytes
* generated by @message or %NULL if @error is set. Free with g_free().
*
* Since: 2.26
*/
guchar *
g_dbus_message_to_blob (GDBusMessage *message,
gsize *out_size,
GDBusCapabilityFlags capabilities,
GError **error)
{
GMemoryOutputStream *mos;
GDataOutputStream *dos;
guchar *ret;
gsize size;
GDataStreamByteOrder byte_order;
goffset body_len_offset;
goffset body_start_offset;
gsize body_size;
GVariant *header_fields;
GVariantBuilder builder;
GHashTableIter hash_iter;
gpointer key;
GVariant *header_value;
GVariant *signature;
const gchar *signature_str;
gint num_fds_in_message;
gint num_fds_according_to_header;
/* TODO: check against @capabilities */
ret = NULL;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
g_return_val_if_fail (out_size != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
mos = G_MEMORY_OUTPUT_STREAM (g_memory_output_stream_new (NULL, 0, g_realloc, g_free));
dos = g_data_output_stream_new (G_OUTPUT_STREAM (mos));
/* TODO: detect endianess... */
byte_order = G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN;
g_data_output_stream_set_byte_order (dos, byte_order);
/* Core header */
g_data_output_stream_put_byte (dos, byte_order == G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN ? 'l' : 'B', NULL, NULL);
g_data_output_stream_put_byte (dos, message->priv->type, NULL, NULL);
g_data_output_stream_put_byte (dos, message->priv->flags, NULL, NULL);
g_data_output_stream_put_byte (dos, 1, NULL, NULL); /* major protocol version */
body_len_offset = g_memory_output_stream_get_data_size (mos);
/* body length - will be filled in later */
g_data_output_stream_put_uint32 (dos, 0xF00DFACE, NULL, NULL);
g_data_output_stream_put_uint32 (dos, message->priv->serial, NULL, NULL);
num_fds_in_message = 0;
#ifdef G_OS_UNIX
if (message->priv->fd_list != NULL)
num_fds_in_message = g_unix_fd_list_get_length (message->priv->fd_list);
#endif
num_fds_according_to_header = g_dbus_message_get_num_unix_fds (message);
/* TODO: check we have all the right header fields and that they are the correct value etc etc */
if (num_fds_in_message != num_fds_according_to_header)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Message has %d fds but the header field indicates %d fds"),
num_fds_in_message,
num_fds_according_to_header);
goto out;
}
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{yv}"));
g_hash_table_iter_init (&hash_iter, message->priv->headers);
while (g_hash_table_iter_next (&hash_iter, &key, (gpointer) &header_value))
{
g_variant_builder_add (&builder,
"{yv}",
(guchar) GPOINTER_TO_UINT (key),
header_value);
}
header_fields = g_variant_builder_end (&builder);
if (!append_value_to_blob (header_fields,
g_variant_get_type (header_fields),
mos, dos,
NULL,
error))
{
g_variant_unref (header_fields);
goto out;
}
g_variant_unref (header_fields);
/* header size must be a multiple of 8 */
ensure_output_padding (mos, dos, 8);
body_start_offset = g_memory_output_stream_get_data_size (mos);
signature = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE);
signature_str = NULL;
if (signature != NULL)
signature_str = g_variant_get_string (signature, NULL);
if (message->priv->body != NULL)
{
gchar *tupled_signature_str;
tupled_signature_str = g_strdup_printf ("(%s)", signature_str);
if (signature == NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Message body has signature `%s' but there is no signature header"),
signature_str);
g_free (tupled_signature_str);
goto out;
}
else if (g_strcmp0 (tupled_signature_str, g_variant_get_type_string (message->priv->body)) != 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Message body has type signature `%s' but signature in the header field is `%s'"),
tupled_signature_str, g_variant_get_type_string (message->priv->body));
g_free (tupled_signature_str);
goto out;
}
g_free (tupled_signature_str);
if (!append_body_to_blob (message->priv->body, mos, dos, error))
goto out;
}
else
{
if (signature != NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Message body is empty but signature in the header field is `(%s)'"),
signature_str);
goto out;
}
}
/* OK, we're done writing the message - set the body length */
size = g_memory_output_stream_get_data_size (mos);
body_size = size - body_start_offset;
if (!g_seekable_seek (G_SEEKABLE (mos), body_len_offset, G_SEEK_SET, NULL, error))
goto out;
g_data_output_stream_put_uint32 (dos, body_size, NULL, NULL);
*out_size = size;
ret = g_memdup (g_memory_output_stream_get_data (mos), size);
out:
g_object_unref (dos);
g_object_unref (mos);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static guint32
get_uint32_header (GDBusMessage *message,
GDBusMessageHeaderField header_field)
{
GVariant *value;
guint32 ret;
ret = 0;
value = g_hash_table_lookup (message->priv->headers, GUINT_TO_POINTER (header_field));
if (value != NULL && g_variant_is_of_type (value, G_VARIANT_TYPE_UINT32))
ret = g_variant_get_uint32 (value);
return ret;
}
static const gchar *
get_string_header (GDBusMessage *message,
GDBusMessageHeaderField header_field)
{
GVariant *value;
const gchar *ret;
ret = NULL;
value = g_hash_table_lookup (message->priv->headers, GUINT_TO_POINTER (header_field));
if (value != NULL && g_variant_is_of_type (value, G_VARIANT_TYPE_STRING))
ret = g_variant_get_string (value, NULL);
return ret;
}
static const gchar *
get_object_path_header (GDBusMessage *message,
GDBusMessageHeaderField header_field)
{
GVariant *value;
const gchar *ret;
ret = NULL;
value = g_hash_table_lookup (message->priv->headers, GUINT_TO_POINTER (header_field));
if (value != NULL && g_variant_is_of_type (value, G_VARIANT_TYPE_OBJECT_PATH))
ret = g_variant_get_string (value, NULL);
return ret;
}
static const gchar *
get_signature_header (GDBusMessage *message,
GDBusMessageHeaderField header_field)
{
GVariant *value;
const gchar *ret;
ret = NULL;
value = g_hash_table_lookup (message->priv->headers, GUINT_TO_POINTER (header_field));
if (value != NULL && g_variant_is_of_type (value, G_VARIANT_TYPE_SIGNATURE))
ret = g_variant_get_string (value, NULL);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static void
set_uint32_header (GDBusMessage *message,
GDBusMessageHeaderField header_field,
guint32 value)
{
g_dbus_message_set_header (message,
header_field,
g_variant_new_uint32 (value));
}
static void
set_string_header (GDBusMessage *message,
GDBusMessageHeaderField header_field,
const gchar *value)
{
g_dbus_message_set_header (message,
header_field,
value == NULL ? NULL : g_variant_new_string (value));
}
static void
set_object_path_header (GDBusMessage *message,
GDBusMessageHeaderField header_field,
const gchar *value)
{
g_dbus_message_set_header (message,
header_field,
value == NULL ? NULL : g_variant_new_object_path (value));
}
static void
set_signature_header (GDBusMessage *message,
GDBusMessageHeaderField header_field,
const gchar *value)
{
g_dbus_message_set_header (message,
header_field,
value == NULL ? NULL : g_variant_new_signature (value));
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_reply_serial:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL header field.
*
* Returns: The value.
*
* Since: 2.26
*/
guint32
g_dbus_message_get_reply_serial (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), 0);
return get_uint32_header (message, G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL);
}
/**
* g_dbus_message_set_reply_serial:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_reply_serial (GDBusMessage *message,
guint32 value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
set_uint32_header (message, G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_interface:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE header field.
*
* Returns: The value.
*
* Since: 2.26
*/
const gchar *
g_dbus_message_get_interface (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
return get_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE);
}
/**
* g_dbus_message_set_interface:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_interface (GDBusMessage *message,
const gchar *value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (value == NULL || g_dbus_is_interface_name (value));
set_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_member:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_MEMBER header field.
*
* Returns: The value.
*
* Since: 2.26
*/
const gchar *
g_dbus_message_get_member (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
return get_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_MEMBER);
}
/**
* g_dbus_message_set_member:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_MEMBER header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_member (GDBusMessage *message,
const gchar *value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (value == NULL || g_dbus_is_member_name (value));
set_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_MEMBER, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_path:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_PATH header field.
*
* Returns: The value.
*
* Since: 2.26
*/
const gchar *
g_dbus_message_get_path (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
return get_object_path_header (message, G_DBUS_MESSAGE_HEADER_FIELD_PATH);
}
/**
* g_dbus_message_set_path:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_PATH header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_path (GDBusMessage *message,
const gchar *value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (value == NULL || g_variant_is_object_path (value));
set_object_path_header (message, G_DBUS_MESSAGE_HEADER_FIELD_PATH, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_sender:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_SENDER header field.
*
* Returns: The value.
*
* Since: 2.26
*/
const gchar *
g_dbus_message_get_sender (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
return get_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_SENDER);
}
/**
* g_dbus_message_set_sender:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_SENDER header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_sender (GDBusMessage *message,
const gchar *value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (value == NULL || g_dbus_is_name (value));
set_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_SENDER, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_destination:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION header field.
*
* Returns: The value.
*
* Since: 2.26
*/
const gchar *
g_dbus_message_get_destination (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
return get_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION);
}
/**
* g_dbus_message_set_destination:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_destination (GDBusMessage *message,
const gchar *value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (value == NULL || g_dbus_is_name (value));
set_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_error_name:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME header field.
*
* Returns: The value.
*
* Since: 2.26
*/
const gchar *
g_dbus_message_get_error_name (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
return get_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME);
}
/**
* g_dbus_message_set_error_name:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_error_name (GDBusMessage *message,
const gchar *value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (value == NULL || g_dbus_is_interface_name (value));
set_string_header (message, G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_signature:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE header field.
*
* Returns: The value.
*
* Since: 2.26
*/
const gchar *
g_dbus_message_get_signature (GDBusMessage *message)
{
const gchar *ret;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
ret = get_signature_header (message, G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE);
if (ret == NULL)
ret = "";
return ret;
}
/**
* g_dbus_message_set_signature:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_signature (GDBusMessage *message,
const gchar *value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (value == NULL || g_variant_is_signature (value));
set_signature_header (message, G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_arg0:
* @message: A #GDBusMessage.
*
* Convenience to get the first item in the body of @message.
*
* Returns: The string item or %NULL if the first item in the body of
* @message is not a string.
*
* Since: 2.26
*/
const gchar *
g_dbus_message_get_arg0 (GDBusMessage *message)
{
const gchar *ret;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
ret = NULL;
if (message->priv->body != NULL && g_variant_is_of_type (message->priv->body, G_VARIANT_TYPE_TUPLE))
{
GVariant *item;
item = g_variant_get_child_value (message->priv->body, 0);
if (g_variant_is_of_type (item, G_VARIANT_TYPE_STRING))
ret = g_variant_get_string (item, NULL);
}
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_num_unix_fds:
* @message: A #GDBusMessage.
*
* Convenience getter for the %G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS header field.
*
* Returns: The value.
*
* Since: 2.26
*/
guint32
g_dbus_message_get_num_unix_fds (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), 0);
return get_uint32_header (message, G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS);
}
/**
* g_dbus_message_set_num_unix_fds:
* @message: A #GDBusMessage.
* @value: The value to set.
*
* Convenience setter for the %G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS header field.
*
* Since: 2.26
*/
void
g_dbus_message_set_num_unix_fds (GDBusMessage *message,
guint32 value)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
set_uint32_header (message, G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS, value);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_to_gerror:
* @message: A #GDBusMessage.
* @error: The #GError to set.
*
* If @message is not of type %G_DBUS_MESSAGE_TYPE_ERROR does
* nothing and returns %FALSE.
*
* Otherwise this method encodes the error in @message as a #GError
* using g_dbus_error_set_dbus_error() using the information in the
* %G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME header field of @message as
* well as the first string item in @message's body.
*
* Returns: %TRUE if @error was set, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_message_to_gerror (GDBusMessage *message,
GError **error)
{
gboolean ret;
const gchar *error_name;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
ret = FALSE;
if (message->priv->type != G_DBUS_MESSAGE_TYPE_ERROR)
goto out;
error_name = g_dbus_message_get_error_name (message);
if (error_name != NULL)
{
GVariant *body;
body = g_dbus_message_get_body (message);
if (body != NULL && g_variant_is_of_type (body, G_VARIANT_TYPE ("(s)")))
{
const gchar *error_message;
g_variant_get (body, "(&s)", &error_message);
g_dbus_error_set_dbus_error (error,
error_name,
error_message,
NULL);
}
else
{
/* these two situations are valid, yet pretty rare */
if (body != NULL)
{
g_dbus_error_set_dbus_error (error,
error_name,
"",
_("Error return with body of type `%s'"),
g_variant_get_type_string (body));
}
else
{
g_dbus_error_set_dbus_error (error,
error_name,
"",
_("Error return with empty body"));
}
}
}
else
{
/* TOOD: this shouldn't happen - should check this at message serialization
* time and disconnect the peer.
*/
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"Error return without error-name header!");
}
ret = TRUE;
out:
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static gchar *
enum_to_string (GType enum_type, gint value)
{
gchar *ret;
GEnumClass *klass;
GEnumValue *enum_value;
klass = g_type_class_ref (enum_type);
enum_value = g_enum_get_value (klass, value);
if (enum_value != NULL)
ret = g_strdup (enum_value->value_nick);
else
ret = g_strdup_printf ("unknown (value %d)", value);
g_type_class_unref (klass);
return ret;
}
static gchar *
flags_to_string (GType flags_type, guint value)
{
GString *s;
GFlagsClass *klass;
guint n;
klass = g_type_class_ref (flags_type);
s = g_string_new (NULL);
for (n = 0; n < 32; n++)
{
if ((value & (1<<n)) != 0)
{
GFlagsValue *flags_value;
flags_value = g_flags_get_first_value (klass, (1<<n));
if (s->len > 0)
g_string_append_c (s, ',');
if (flags_value != NULL)
g_string_append (s, flags_value->value_nick);
else
g_string_append_printf (s, "unknown (bit %d)", n);
}
}
if (s->len == 0)
g_string_append (s, "none");
g_type_class_unref (klass);
return g_string_free (s, FALSE);;
}
static gint
_sort_keys_func (gconstpointer a,
gconstpointer b)
{
gint ia;
gint ib;
ia = GPOINTER_TO_INT (a);
ib = GPOINTER_TO_INT (b);
return ia - ib;
}
/**
* g_dbus_message_print:
* @message: A #GDBusMessage.
* @indent: Indentation level.
*
* Produces a human-readable multi-line description of @message.
*
* The contents of the description has no ABI guarantees, the contents
* and formatting is subject to change at any time. Typical output
* looks something like this:
* <programlisting>
* Type: method-call
* Flags: none
* Version: 0
* Serial: 4
* Headers:
* path -> objectpath '/org/gtk/GDBus/TestObject'
* interface -> 'org.gtk.GDBus.TestInterface'
* member -> 'GimmeStdout'
* destination -> ':1.146'
* Body: ()
* UNIX File Descriptors:
* (none)
* </programlisting>
* or
* <programlisting>
* Type: method-return
* Flags: no-reply-expected
* Version: 0
* Serial: 477
* Headers:
* reply-serial -> uint32 4
* destination -> ':1.159'
* sender -> ':1.146'
* num-unix-fds -> uint32 1
* Body: ()
* UNIX File Descriptors:
* fd 12: dev=0:10,mode=020620,ino=5,uid=500,gid=5,rdev=136:2,size=0,atime=1273085037,mtime=1273085851,ctime=1272982635
* </programlisting>
*
* Returns: A string that should be freed with g_free().
*
* Since: 2.26
*/
gchar *
g_dbus_message_print (GDBusMessage *message,
guint indent)
{
GString *str;
gchar *s;
GList *keys;
GList *l;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
str = g_string_new (NULL);
s = enum_to_string (G_TYPE_DBUS_MESSAGE_TYPE, message->priv->type);
g_string_append_printf (str, "%*sType: %s\n", indent, "", s);
g_free (s);
s = flags_to_string (G_TYPE_DBUS_MESSAGE_FLAGS, message->priv->flags);
g_string_append_printf (str, "%*sFlags: %s\n", indent, "", s);
g_free (s);
g_string_append_printf (str, "%*sVersion: %d\n", indent, "", message->priv->major_protocol_version);
g_string_append_printf (str, "%*sSerial: %d\n", indent, "", message->priv->serial);
g_string_append_printf (str, "%*sHeaders:\n", indent, "");
keys = g_hash_table_get_keys (message->priv->headers);
keys = g_list_sort (keys, _sort_keys_func);
if (keys != NULL)
{
for (l = keys; l != NULL; l = l->next)
{
gint key = GPOINTER_TO_INT (l->data);
GVariant *value;
gchar *value_str;
value = g_hash_table_lookup (message->priv->headers, l->data);
g_assert (value != NULL);
s = enum_to_string (G_TYPE_DBUS_MESSAGE_HEADER_FIELD, key);
value_str = g_variant_print (value, TRUE);
g_string_append_printf (str, "%*s %s -> %s\n", indent, "", s, value_str);
g_free (s);
g_free (value_str);
}
}
else
{
g_string_append_printf (str, "%*s (none)\n", indent, "");
}
g_string_append_printf (str, "%*sBody: ", indent, "");
if (message->priv->body != NULL)
{
g_variant_print_string (message->priv->body,
str,
TRUE);
}
else
{
g_string_append (str, "()");
}
g_string_append (str, "\n");
#ifdef G_OS_UNIX
g_string_append_printf (str, "%*sUNIX File Descriptors:\n", indent, "");
if (message->priv->fd_list != NULL)
{
gint num_fds;
const gint *fds;
gint n;
fds = g_unix_fd_list_peek_fds (message->priv->fd_list, &num_fds);
if (num_fds > 0)
{
for (n = 0; n < num_fds; n++)
{
GString *fs;
struct stat statbuf;
fs = g_string_new (NULL);
if (fstat (fds[n], &statbuf) == 0)
{
g_string_append_printf (fs, "%s" "dev=%d:%d", fs->len > 0 ? "," : "",
major (statbuf.st_dev), minor (statbuf.st_dev));
g_string_append_printf (fs, "%s" "mode=0%o", fs->len > 0 ? "," : "",
statbuf.st_mode);
g_string_append_printf (fs, "%s" "ino=%" G_GUINT64_FORMAT, fs->len > 0 ? "," : "",
(guint64) statbuf.st_ino);
g_string_append_printf (fs, "%s" "uid=%d", fs->len > 0 ? "," : "",
statbuf.st_uid);
g_string_append_printf (fs, "%s" "gid=%d", fs->len > 0 ? "," : "",
statbuf.st_gid);
g_string_append_printf (fs, "%s" "rdev=%d:%d", fs->len > 0 ? "," : "",
major (statbuf.st_rdev), minor (statbuf.st_rdev));
g_string_append_printf (fs, "%s" "size=%" G_GUINT64_FORMAT, fs->len > 0 ? "," : "",
(guint64) statbuf.st_size);
g_string_append_printf (fs, "%s" "atime=%" G_GUINT64_FORMAT, fs->len > 0 ? "," : "",
(guint64) statbuf.st_atime);
g_string_append_printf (fs, "%s" "mtime=%" G_GUINT64_FORMAT, fs->len > 0 ? "," : "",
(guint64) statbuf.st_mtime);
g_string_append_printf (fs, "%s" "ctime=%" G_GUINT64_FORMAT, fs->len > 0 ? "," : "",
(guint64) statbuf.st_ctime);
}
else
{
g_string_append_printf (fs, "(fstat failed: %s)", strerror (errno));
}
g_string_append_printf (str, "%*s fd %d: %s\n", indent, "", fds[n], fs->str);
g_string_free (fs, TRUE);
}
}
else
{
g_string_append_printf (str, "%*s (empty)\n", indent, "");
}
}
else
{
g_string_append_printf (str, "%*s (none)\n", indent, "");
}
#endif
return g_string_free (str, FALSE);
}
#define __G_DBUS_MESSAGE_C__
#include "gioaliasdef.c"
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