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glib/gio/gdbusmessage.c
Emmanuele Bassi b53218a509 Merge branch '3037-doc-build-cleanups' into 'main' 
build: Rename -Dgtk_doc option to -Ddocumentation and fix some g-ir-scanner warnings

See merge request GNOME/glib!3736
2023-12-01 22:48:17 +00:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 2.1 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, see <http://www.gnu.org/licenses/>.
*
* 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>
#if MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#elif MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#elif MAJOR_IN_TYPES
#include <sys/types.h>
#else
#define MAJOR_MINOR_NOT_FOUND 1
#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"
#include "gutilsprivate.h"
#ifdef G_OS_UNIX
#include "gunixfdlist.h"
#endif
#include "glibintl.h"
/* See https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-marshaling-signature
* This is 64 containers plus 1 value within them. */
#define G_DBUS_MAX_TYPE_DEPTH (64 + 1)
typedef struct _GMemoryBuffer GMemoryBuffer;
struct _GMemoryBuffer
{
gsize len;
gsize valid_len;
gsize pos;
gchar *data;
GDataStreamByteOrder byte_order;
};
static gboolean
g_memory_buffer_is_byteswapped (GMemoryBuffer *mbuf)
{
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
return mbuf->byte_order == G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
#else
return mbuf->byte_order == G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN;
#endif
}
static guchar
g_memory_buffer_read_byte (GMemoryBuffer *mbuf,
GError **error)
{
g_return_val_if_fail (error == NULL || *error == NULL, 0);
if (mbuf->pos >= mbuf->valid_len)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Unexpected end of message while reading byte.");
return 0;
}
return mbuf->data [mbuf->pos++];
}
static gint16
g_memory_buffer_read_int16 (GMemoryBuffer *mbuf,
GError **error)
{
gint16 v;
g_return_val_if_fail (error == NULL || *error == NULL, -1);
if (mbuf->pos > mbuf->valid_len - 2)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Unexpected end of message while reading int16.");
return 0;
}
memcpy (&v, mbuf->data + mbuf->pos, 2);
mbuf->pos += 2;
if (g_memory_buffer_is_byteswapped (mbuf))
v = GUINT16_SWAP_LE_BE (v);
return v;
}
static guint16
g_memory_buffer_read_uint16 (GMemoryBuffer *mbuf,
GError **error)
{
guint16 v;
g_return_val_if_fail (error == NULL || *error == NULL, 0);
if (mbuf->pos > mbuf->valid_len - 2)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Unexpected end of message while reading uint16.");
return 0;
}
memcpy (&v, mbuf->data + mbuf->pos, 2);
mbuf->pos += 2;
if (g_memory_buffer_is_byteswapped (mbuf))
v = GUINT16_SWAP_LE_BE (v);
return v;
}
static gint32
g_memory_buffer_read_int32 (GMemoryBuffer *mbuf,
GError **error)
{
gint32 v;
g_return_val_if_fail (error == NULL || *error == NULL, -1);
if (mbuf->pos > mbuf->valid_len - 4)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Unexpected end of message while reading int32.");
return 0;
}
memcpy (&v, mbuf->data + mbuf->pos, 4);
mbuf->pos += 4;
if (g_memory_buffer_is_byteswapped (mbuf))
v = GUINT32_SWAP_LE_BE (v);
return v;
}
static guint32
g_memory_buffer_read_uint32 (GMemoryBuffer *mbuf,
GError **error)
{
guint32 v;
g_return_val_if_fail (error == NULL || *error == NULL, 0);
if (mbuf->pos > mbuf->valid_len - 4)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Unexpected end of message while reading uint32.");
return 0;
}
memcpy (&v, mbuf->data + mbuf->pos, 4);
mbuf->pos += 4;
if (g_memory_buffer_is_byteswapped (mbuf))
v = GUINT32_SWAP_LE_BE (v);
return v;
}
static gint64
g_memory_buffer_read_int64 (GMemoryBuffer *mbuf,
GError **error)
{
gint64 v;
g_return_val_if_fail (error == NULL || *error == NULL, -1);
if (mbuf->pos > mbuf->valid_len - 8)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Unexpected end of message while reading int64.");
return 0;
}
memcpy (&v, mbuf->data + mbuf->pos, 8);
mbuf->pos += 8;
if (g_memory_buffer_is_byteswapped (mbuf))
v = GUINT64_SWAP_LE_BE (v);
return v;
}
static guint64
g_memory_buffer_read_uint64 (GMemoryBuffer *mbuf,
GError **error)
{
guint64 v;
g_return_val_if_fail (error == NULL || *error == NULL, 0);
if (mbuf->pos > mbuf->valid_len - 8)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Unexpected end of message while reading uint64.");
return 0;
}
memcpy (&v, mbuf->data + mbuf->pos, 8);
mbuf->pos += 8;
if (g_memory_buffer_is_byteswapped (mbuf))
v = GUINT64_SWAP_LE_BE (v);
return v;
}
#define MIN_ARRAY_SIZE 128
static void
array_resize (GMemoryBuffer *mbuf,
gsize size)
{
gpointer data;
gsize len;
if (mbuf->len == size)
return;
len = mbuf->len;
data = g_realloc (mbuf->data, size);
if (size > len)
memset ((guint8 *)data + len, 0, size - len);
mbuf->data = data;
mbuf->len = size;
if (mbuf->len < mbuf->valid_len)
mbuf->valid_len = mbuf->len;
}
static gboolean
g_memory_buffer_write (GMemoryBuffer *mbuf,
const void *buffer,
gsize count)
{
guint8 *dest;
gsize new_size;
if (count == 0)
return TRUE;
/* Check for address space overflow, but only if the buffer is resizable.
Otherwise we just do a short write and don't worry. */
if (mbuf->pos + count < mbuf->pos)
return FALSE;
if (mbuf->pos + count > mbuf->len)
{
/* At least enough to fit the write, rounded up
for greater than linear growth.
TODO: This wastes a lot of memory at large buffer sizes.
Figure out a more rational allocation strategy. */
new_size = g_nearest_pow (mbuf->pos + count);
/* Check for overflow again. We have checked if
pos + count > G_MAXSIZE, but now check if g_nearest_pow () has
overflowed */
if (new_size == 0)
return FALSE;
new_size = MAX (new_size, MIN_ARRAY_SIZE);
array_resize (mbuf, new_size);
}
dest = (guint8 *)mbuf->data + mbuf->pos;
memcpy (dest, buffer, count);
mbuf->pos += count;
if (mbuf->pos > mbuf->valid_len)
mbuf->valid_len = mbuf->pos;
return TRUE;
}
static gboolean
g_memory_buffer_put_byte (GMemoryBuffer *mbuf,
guchar data)
{
return g_memory_buffer_write (mbuf, &data, 1);
}
static gboolean
g_memory_buffer_put_int16 (GMemoryBuffer *mbuf,
gint16 data)
{
switch (mbuf->byte_order)
{
case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
data = GINT16_TO_BE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
data = GINT16_TO_LE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
default:
break;
}
return g_memory_buffer_write (mbuf, &data, 2);
}
static gboolean
g_memory_buffer_put_uint16 (GMemoryBuffer *mbuf,
guint16 data)
{
switch (mbuf->byte_order)
{
case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
data = GUINT16_TO_BE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
data = GUINT16_TO_LE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
default:
break;
}
return g_memory_buffer_write (mbuf, &data, 2);
}
static gboolean
g_memory_buffer_put_int32 (GMemoryBuffer *mbuf,
gint32 data)
{
switch (mbuf->byte_order)
{
case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
data = GINT32_TO_BE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
data = GINT32_TO_LE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
default:
break;
}
return g_memory_buffer_write (mbuf, &data, 4);
}
static gboolean
g_memory_buffer_put_uint32 (GMemoryBuffer *mbuf,
guint32 data)
{
switch (mbuf->byte_order)
{
case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
data = GUINT32_TO_BE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
data = GUINT32_TO_LE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
default:
break;
}
return g_memory_buffer_write (mbuf, &data, 4);
}
static gboolean
g_memory_buffer_put_int64 (GMemoryBuffer *mbuf,
gint64 data)
{
switch (mbuf->byte_order)
{
case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
data = GINT64_TO_BE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
data = GINT64_TO_LE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
default:
break;
}
return g_memory_buffer_write (mbuf, &data, 8);
}
static gboolean
g_memory_buffer_put_uint64 (GMemoryBuffer *mbuf,
guint64 data)
{
switch (mbuf->byte_order)
{
case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
data = GUINT64_TO_BE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
data = GUINT64_TO_LE (data);
break;
case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
default:
break;
}
return g_memory_buffer_write (mbuf, &data, 8);
}
static gboolean
g_memory_buffer_put_string (GMemoryBuffer *mbuf,
const char *str)
{
g_return_val_if_fail (str != NULL, FALSE);
return g_memory_buffer_write (mbuf, str, strlen (str));
}
typedef struct _GDBusMessageClass GDBusMessageClass;
/**
* GDBusMessageClass:
*
* Class structure for #GDBusMessage.
*
* Since: 2.26
*/
struct _GDBusMessageClass
{
/*< private >*/
GObjectClass parent_class;
};
/**
* GDBusMessage:
*
* A type for representing D-Bus messages that can be sent or received
* on a [class@Gio.DBusConnection].
*
* Since: 2.26
*/
struct _GDBusMessage
{
/*< private >*/
GObject parent_instance;
GDBusMessageType type;
GDBusMessageFlags flags;
gboolean locked;
GDBusMessageByteOrder byte_order;
guchar major_protocol_version;
guint32 serial;
GHashTable *headers;
GVariant *body;
GVariant *arg0_cache; /* (nullable) (owned) */
#ifdef G_OS_UNIX
GUnixFDList *fd_list;
#endif
};
enum
{
PROP_0,
PROP_LOCKED
};
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->headers != NULL)
g_hash_table_unref (message->headers);
if (message->body != NULL)
g_variant_unref (message->body);
g_clear_pointer (&message->arg0_cache, g_variant_unref);
#ifdef G_OS_UNIX
if (message->fd_list != NULL)
g_object_unref (message->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_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GDBusMessage *message = G_DBUS_MESSAGE (object);
switch (prop_id)
{
case PROP_LOCKED:
g_value_set_boolean (value, g_dbus_message_get_locked (message));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_dbus_message_class_init (GDBusMessageClass *klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_dbus_message_finalize;
gobject_class->get_property = g_dbus_message_get_property;
/**
* GDBusConnection:locked:
*
* A boolean specifying whether the message is locked.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_LOCKED,
g_param_spec_boolean ("locked", NULL, NULL,
FALSE,
G_PARAM_READABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
}
static void
g_dbus_message_init (GDBusMessage *message)
{
/* Any D-Bus implementation is supposed to handle both Big and
* Little Endian encodings and the Endianness is part of the D-Bus
* message - we prefer to use Big Endian (since it's Network Byte
* Order and just easier to read for humans) but if the machine is
* Little Endian we use that for performance reasons.
*/
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
message->byte_order = G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN;
#else
/* this could also be G_PDP_ENDIAN */
message->byte_order = G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN;
#endif
message->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: (nullable): A valid D-Bus name or %NULL.
* @path: A valid object path.
* @interface_: (nullable): 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->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.
* @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 (g_dbus_is_interface_name (interface_), NULL);
message = g_dbus_message_new ();
message->type = G_DBUS_MESSAGE_TYPE_SIGNAL;
message->flags = G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
g_dbus_message_set_path (message, path);
g_dbus_message_set_member (message, signal);
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: (transfer full): #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->type = G_DBUS_MESSAGE_TYPE_METHOD_RETURN;
message->flags = G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
/* reply with same endianness */
message->byte_order = method_call_message->byte_order;
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: (transfer full): 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: (transfer full): 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->type = G_DBUS_MESSAGE_TYPE_ERROR;
message->flags = G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
/* reply with same endianness */
message->byte_order = method_call_message->byte_order;
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: (transfer full): A #GDBusMessage. Free with g_object_unref().
*
* Since: 2.26
*/
G_GNUC_PRINTF(3, 0)
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;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_byte_order:
* @message: A #GDBusMessage.
*
* Gets the byte order of @message.
*
* Returns: The byte order.
*/
GDBusMessageByteOrder
g_dbus_message_get_byte_order (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), (GDBusMessageByteOrder) 0);
return message->byte_order;
}
/**
* g_dbus_message_set_byte_order:
* @message: A #GDBusMessage.
* @byte_order: The byte order.
*
* Sets the byte order of @message.
*/
void
g_dbus_message_set_byte_order (GDBusMessage *message,
GDBusMessageByteOrder byte_order)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
if (message->locked)
{
g_warning ("%s: Attempted to modify a locked message", G_STRFUNC);
return;
}
message->byte_order = byte_order;
}
/* ---------------------------------------------------------------------------------------------------- */
/* 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->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 ((guint) type < 256);
if (message->locked)
{
g_warning ("%s: Attempted to modify a locked message", G_STRFUNC);
return;
}
message->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->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 ((guint) flags < 256);
if (message->locked)
{
g_warning ("%s: Attempted to modify a locked message", G_STRFUNC);
return;
}
message->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->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));
if (message->locked)
{
g_warning ("%s: Attempted to modify a locked message", G_STRFUNC);
return;
}
message->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.
*
* The caller is responsible for checking the type of the returned #GVariant
* matches what is expected.
*
* Returns: (transfer none) (nullable): 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 ((guint) header_field < 256, NULL);
return g_hash_table_lookup (message->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: (nullable): 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 ((guint) header_field < 256);
if (message->locked)
{
g_warning ("%s: Attempted to modify a locked message", G_STRFUNC);
return;
}
if (value == NULL)
{
g_hash_table_remove (message->headers, GUINT_TO_POINTER (header_field));
}
else
{
g_hash_table_insert (message->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: (array zero-terminated=1): 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)
{
GPtrArray *keys;
GArray *array;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
keys = g_hash_table_get_keys_as_ptr_array (message->headers);
array = g_array_sized_new (FALSE, FALSE, sizeof (guchar), keys->len + 1);
for (guint i = 0; i < keys->len; ++i)
{
guchar val = GPOINTER_TO_UINT (g_ptr_array_index (keys, i));
g_array_append_val (array, val);
}
g_assert (array->len == keys->len);
g_clear_pointer (&keys, g_ptr_array_unref);
guchar invalid_field = G_DBUS_MESSAGE_HEADER_FIELD_INVALID;
g_array_append_val (array, invalid_field);
return (guchar *) g_array_free (array, FALSE);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_body:
* @message: A #GDBusMessage.
*
* Gets the body of a message.
*
* Returns: (nullable) (transfer none): 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->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->locked)
{
g_warning ("%s: Attempted to modify a locked message", G_STRFUNC);
return;
}
if (message->body != NULL)
g_variant_unref (message->body);
if (body == NULL)
{
message->body = NULL;
message->arg0_cache = NULL;
g_dbus_message_set_signature (message, NULL);
}
else
{
const gchar *type_string;
gsize type_string_len;
gchar *signature;
message->body = g_variant_ref_sink (body);
if (g_variant_is_of_type (message->body, G_VARIANT_TYPE_TUPLE) &&
g_variant_n_children (message->body) > 0)
message->arg0_cache = g_variant_get_child_value (message->body, 0);
else
message->arg0_cache = NULL;
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.
*
* The file descriptors normally correspond to %G_VARIANT_TYPE_HANDLE
* values in the body of the message. For example,
* if g_variant_get_handle() returns 5, that is intended to be a reference
* to the file descriptor that can be accessed by
* `g_unix_fd_list_get (list, 5, ...)`.
*
* Returns: (nullable) (transfer none): 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->fd_list;
}
/**
* g_dbus_message_set_unix_fd_list:
* @message: A #GDBusMessage.
* @fd_list: (nullable): 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.
*
* When designing D-Bus APIs that are intended to be interoperable,
* please note that non-GDBus implementations of D-Bus can usually only
* access file descriptors if they are referenced by a value of type
* %G_VARIANT_TYPE_HANDLE in the body of the message.
*
* 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->locked)
{
g_warning ("%s: Attempted to modify a locked message", G_STRFUNC);
return;
}
if (message->fd_list != NULL)
g_object_unref (message->fd_list);
if (fd_list != NULL)
{
message->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->fd_list = NULL;
g_dbus_message_set_num_unix_fds (message, 0);
}
}
#endif
/* ---------------------------------------------------------------------------------------------------- */
static guint
get_type_fixed_size (const GVariantType *type)
{
/* NB: we do not treat 'b' as fixed-size here because GVariant and
* D-Bus disagree about the size.
*/
switch (*g_variant_type_peek_string (type))
{
case 'y':
return 1;
case 'n': case 'q':
return 2;
case 'i': case 'u': case 'h':
return 4;
case 'x': case 't': case 'd':
return 8;
default:
return 0;
}
}
static gboolean
validate_headers (GDBusMessage *message,
GError **error)
{
gboolean ret;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
ret = FALSE;
switch (message->type)
{
case G_DBUS_MESSAGE_TYPE_INVALID:
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("type is INVALID"));
goto out;
break;
case G_DBUS_MESSAGE_TYPE_METHOD_CALL:
{
GVariant *path_variant = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_PATH);
GVariant *member_variant = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_MEMBER);
if (path_variant == NULL ||
!g_variant_is_of_type (path_variant, G_VARIANT_TYPE_OBJECT_PATH) ||
member_variant == NULL ||
!g_variant_is_of_type (member_variant, G_VARIANT_TYPE_STRING) ||
!g_dbus_is_member_name (g_variant_get_string (member_variant, NULL)))
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("METHOD_CALL message: PATH or MEMBER header field is missing or invalid"));
goto out;
}
}
break;
case G_DBUS_MESSAGE_TYPE_METHOD_RETURN:
{
GVariant *reply_serial_variant = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL);
if (reply_serial_variant == NULL ||
!g_variant_is_of_type (reply_serial_variant, G_VARIANT_TYPE_UINT32))
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("METHOD_RETURN message: REPLY_SERIAL header field is missing or invalid"));
goto out;
}
}
break;
case G_DBUS_MESSAGE_TYPE_ERROR:
{
GVariant *error_name_variant = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME);
GVariant *reply_serial_variant = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL);
if (error_name_variant == NULL ||
!g_variant_is_of_type (error_name_variant, G_VARIANT_TYPE_STRING) ||
!g_dbus_is_error_name (g_variant_get_string (error_name_variant, NULL)) ||
reply_serial_variant == NULL ||
!g_variant_is_of_type (reply_serial_variant, G_VARIANT_TYPE_UINT32))
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("ERROR message: REPLY_SERIAL or ERROR_NAME header field is missing or invalid"));
goto out;
}
}
break;
case G_DBUS_MESSAGE_TYPE_SIGNAL:
{
GVariant *path_variant = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_PATH);
GVariant *interface_variant = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE);
GVariant *member_variant = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_MEMBER);
if (path_variant == NULL ||
!g_variant_is_of_type (path_variant, G_VARIANT_TYPE_OBJECT_PATH) ||
interface_variant == NULL ||
!g_variant_is_of_type (interface_variant, G_VARIANT_TYPE_STRING) ||
!g_dbus_is_interface_name (g_variant_get_string (interface_variant, NULL)) ||
member_variant == NULL ||
!g_variant_is_of_type (member_variant, G_VARIANT_TYPE_STRING) ||
!g_dbus_is_member_name (g_variant_get_string (member_variant, NULL)))
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("SIGNAL message: PATH, INTERFACE or MEMBER header field is missing or invalid"));
goto out;
}
if (g_strcmp0 (g_dbus_message_get_path (message), "/org/freedesktop/DBus/Local") == 0)
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("SIGNAL message: The PATH header field is using the reserved value /org/freedesktop/DBus/Local"));
goto out;
}
if (g_strcmp0 (g_dbus_message_get_interface (message), "org.freedesktop.DBus.Local") == 0)
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("SIGNAL message: The INTERFACE header field is using the reserved value org.freedesktop.DBus.Local"));
goto out;
}
}
break;
default:
/* hitherto unknown type - nothing to check */
break;
}
ret = TRUE;
out:
g_assert (ret || (error == NULL || *error != NULL));
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static gboolean
ensure_input_padding (GMemoryBuffer *buf,
gsize padding_size)
{
gsize offset;
gsize wanted_offset;
offset = buf->pos;
wanted_offset = ((offset + padding_size - 1) / padding_size) * padding_size;
buf->pos = wanted_offset;
return TRUE;
}
static const gchar *
read_string (GMemoryBuffer *mbuf,
gsize len,
GError **error)
{
gchar *str;
const gchar *end_valid;
if G_UNLIKELY (mbuf->pos + len >= mbuf->valid_len || mbuf->pos + len < mbuf->pos)
{
mbuf->pos = mbuf->valid_len;
/* G_GSIZE_FORMAT doesn't work with gettext, so we use %lu */
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
g_dngettext (GETTEXT_PACKAGE,
"Wanted to read %lu byte but only got %lu",
"Wanted to read %lu bytes but only got %lu",
(gulong)len),
(gulong)len,
(gulong)(mbuf->valid_len - mbuf->pos));
return NULL;
}
if G_UNLIKELY (mbuf->data[mbuf->pos + len] != '\0')
{
str = g_strndup (mbuf->data + mbuf->pos, len);
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Expected NUL byte after the string “%s” but found byte %d"),
str, mbuf->data[mbuf->pos + len]);
g_free (str);
mbuf->pos += len + 1;
return NULL;
}
str = mbuf->data + mbuf->pos;
mbuf->pos += len + 1;
if G_UNLIKELY (!g_utf8_validate (str, -1, &end_valid))
{
gint offset;
gchar *valid_str;
offset = (gint) (end_valid - str);
valid_str = g_strndup (str, offset);
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Expected valid UTF-8 string but found invalid bytes at byte offset %d (length of string is %d). "
"The valid UTF-8 string up until that point was “%s”"),
offset,
(gint) len,
valid_str);
g_free (valid_str);
return NULL;
}
return str;
}
static gconstpointer
read_bytes (GMemoryBuffer *mbuf,
gsize len,
GError **error)
{
gconstpointer result;
if G_UNLIKELY (mbuf->pos + len > mbuf->valid_len || mbuf->pos + len < mbuf->pos)
{
mbuf->pos = mbuf->valid_len;
/* G_GSIZE_FORMAT doesn't work with gettext, so we use %lu */
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
g_dngettext (GETTEXT_PACKAGE,
"Wanted to read %lu byte but only got %lu",
"Wanted to read %lu bytes but only got %lu",
(gulong)len),
(gulong)len,
(gulong)(mbuf->valid_len - mbuf->pos));
return NULL;
}
result = mbuf->data + mbuf->pos;
mbuf->pos += len;
return result;
}
/* if just_align==TRUE, don't read a value, just align the input stream wrt padding */
/* returns a non-floating GVariant! */
static GVariant *
parse_value_from_blob (GMemoryBuffer *buf,
const GVariantType *type,
guint max_depth,
gboolean just_align,
guint indent,
GError **error)
{
GVariant *ret = NULL;
GError *local_error = NULL;
#ifdef DEBUG_SERIALIZER
gboolean is_leaf;
#endif /* DEBUG_SERIALIZER */
const gchar *type_string;
if (max_depth == 0)
{
g_set_error_literal (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Value nested too deeply"));
goto fail;
}
type_string = g_variant_type_peek_string (type);
#ifdef DEBUG_SERIALIZER
{
gchar *s;
s = g_variant_type_dup_string (type);
g_print ("%*s%s type %s from offset 0x%04x",
indent, "",
just_align ? "Aligning" : "Reading",
s,
(gint) buf->pos);
g_free (s);
}
#endif /* DEBUG_SERIALIZER */
#ifdef DEBUG_SERIALIZER
is_leaf = TRUE;
#endif /* DEBUG_SERIALIZER */
switch (type_string[0])
{
case 'b': /* G_VARIANT_TYPE_BOOLEAN */
ensure_input_padding (buf, 4);
if (!just_align)
{
gboolean v;
v = g_memory_buffer_read_uint32 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_boolean (v);
}
break;
case 'y': /* G_VARIANT_TYPE_BYTE */
if (!just_align)
{
guchar v;
v = g_memory_buffer_read_byte (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_byte (v);
}
break;
case 'n': /* G_VARIANT_TYPE_INT16 */
ensure_input_padding (buf, 2);
if (!just_align)
{
gint16 v;
v = g_memory_buffer_read_int16 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_int16 (v);
}
break;
case 'q': /* G_VARIANT_TYPE_UINT16 */
ensure_input_padding (buf, 2);
if (!just_align)
{
guint16 v;
v = g_memory_buffer_read_uint16 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_uint16 (v);
}
break;
case 'i': /* G_VARIANT_TYPE_INT32 */
ensure_input_padding (buf, 4);
if (!just_align)
{
gint32 v;
v = g_memory_buffer_read_int32 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_int32 (v);
}
break;
case 'u': /* G_VARIANT_TYPE_UINT32 */
ensure_input_padding (buf, 4);
if (!just_align)
{
guint32 v;
v = g_memory_buffer_read_uint32 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_uint32 (v);
}
break;
case 'x': /* G_VARIANT_TYPE_INT64 */
ensure_input_padding (buf, 8);
if (!just_align)
{
gint64 v;
v = g_memory_buffer_read_int64 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_int64 (v);
}
break;
case 't': /* G_VARIANT_TYPE_UINT64 */
ensure_input_padding (buf, 8);
if (!just_align)
{
guint64 v;
v = g_memory_buffer_read_uint64 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_uint64 (v);
}
break;
case 'd': /* G_VARIANT_TYPE_DOUBLE */
ensure_input_padding (buf, 8);
if (!just_align)
{
union {
guint64 v_uint64;
gdouble v_double;
} u;
G_STATIC_ASSERT (sizeof (gdouble) == sizeof (guint64));
u.v_uint64 = g_memory_buffer_read_uint64 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_double (u.v_double);
}
break;
case 's': /* G_VARIANT_TYPE_STRING */
ensure_input_padding (buf, 4);
if (!just_align)
{
guint32 len;
const gchar *v;
len = g_memory_buffer_read_uint32 (buf, &local_error);
if (local_error)
goto fail;
v = read_string (buf, (gsize) len, &local_error);
if (v == NULL)
goto fail;
ret = g_variant_new_string (v);
}
break;
case 'o': /* G_VARIANT_TYPE_OBJECT_PATH */
ensure_input_padding (buf, 4);
if (!just_align)
{
guint32 len;
const gchar *v;
len = g_memory_buffer_read_uint32 (buf, &local_error);
if (local_error)
goto fail;
v = read_string (buf, (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);
goto fail;
}
ret = g_variant_new_object_path (v);
}
break;
case 'g': /* G_VARIANT_TYPE_SIGNATURE */
if (!just_align)
{
guchar len;
const gchar *v;
len = g_memory_buffer_read_byte (buf, &local_error);
if (local_error)
goto fail;
v = read_string (buf, (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);
goto fail;
}
ret = g_variant_new_signature (v);
}
break;
case 'h': /* G_VARIANT_TYPE_HANDLE */
ensure_input_padding (buf, 4);
if (!just_align)
{
gint32 v;
v = g_memory_buffer_read_int32 (buf, &local_error);
if (local_error)
goto fail;
ret = g_variant_new_handle (v);
}
break;
case 'a': /* G_VARIANT_TYPE_ARRAY */
ensure_input_padding (buf, 4);
/* If we are only aligning for this array type, it is the child type of
* another array, which is empty. So, we do not need to add padding for
* this nonexistent array's elements: we only need to align for this
* array itself (4 bytes). See
* <https://bugzilla.gnome.org/show_bug.cgi?id=673612>.
*/
if (!just_align)
{
guint32 array_len;
const GVariantType *element_type;
guint fixed_size;
array_len = g_memory_buffer_read_uint32 (buf, &local_error);
if (local_error)
goto fail;
#ifdef DEBUG_SERIALIZER
is_leaf = FALSE;
g_print (": array spans 0x%04x bytes\n", array_len);
#endif /* DEBUG_SERIALIZER */
if (array_len > (2<<26))
{
/* G_GUINT32_FORMAT doesn't work with gettext, so use u */
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
g_dngettext (GETTEXT_PACKAGE,
"Encountered array of length %u byte. Maximum length is 2<<26 bytes (64 MiB).",
"Encountered array of length %u bytes. Maximum length is 2<<26 bytes (64 MiB).",
array_len),
array_len);
goto fail;
}
element_type = g_variant_type_element (type);
fixed_size = get_type_fixed_size (element_type);
/* Fast-path the cases like 'ay', etc. */
if (fixed_size != 0)
{
gconstpointer array_data;
if (array_len % fixed_size != 0)
{
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Encountered array of type “a%c”, expected to have a length a multiple "
"of %u bytes, but found to be %u bytes in length"),
g_variant_type_peek_string (element_type)[0], fixed_size, array_len);
goto fail;
}
if (max_depth == 1)
{
/* If we had recursed into parse_value_from_blob() again to
* parse the array values, this would have been emitted. */
g_set_error_literal (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Value nested too deeply"));
goto fail;
}
ensure_input_padding (buf, fixed_size);
array_data = read_bytes (buf, array_len, &local_error);
if (array_data == NULL)
goto fail;
ret = g_variant_new_fixed_array (element_type, array_data, array_len / fixed_size, fixed_size);
if (g_memory_buffer_is_byteswapped (buf))
{
GVariant *tmp = g_variant_ref_sink (ret);
ret = g_variant_byteswap (tmp);
g_variant_unref (tmp);
}
}
else
{
GVariantBuilder builder;
goffset offset;
goffset target;
g_variant_builder_init (&builder, type);
if (array_len == 0)
{
GVariant *item G_GNUC_UNUSED /* when compiling with G_DISABLE_ASSERT */;
item = parse_value_from_blob (buf,
element_type,
max_depth - 1,
TRUE,
indent + 2,
NULL);
g_assert (item == NULL);
}
else
{
offset = buf->pos;
target = offset + array_len;
while (offset < target)
{
GVariant *item;
item = parse_value_from_blob (buf,
element_type,
max_depth - 1,
FALSE,
indent + 2,
&local_error);
if (item == NULL)
{
g_variant_builder_clear (&builder);
goto fail;
}
g_variant_builder_add_value (&builder, item);
g_variant_unref (item);
/* Array elements must not be zero-length. There are no
* valid zero-length serialisations of any types which
* can be array elements in the D-Bus wire format, so this
* assertion should always hold.
*
* See https://gitlab.gnome.org/GNOME/glib/-/issues/2557
*/
g_assert (buf->pos > (gsize) offset);
offset = buf->pos;
}
}
ret = g_variant_builder_end (&builder);
}
}
break;
default:
if (g_variant_type_is_dict_entry (type))
{
const GVariantType *key_type;
const GVariantType *value_type;
GVariant *key;
GVariant *value;
ensure_input_padding (buf, 8);
#ifdef DEBUG_SERIALIZER
is_leaf = FALSE;
g_print ("\n");
#endif /* DEBUG_SERIALIZER */
if (!just_align)
{
key_type = g_variant_type_key (type);
key = parse_value_from_blob (buf,
key_type,
max_depth - 1,
FALSE,
indent + 2,
&local_error);
if (key == NULL)
goto fail;
value_type = g_variant_type_value (type);
value = parse_value_from_blob (buf,
value_type,
max_depth - 1,
FALSE,
indent + 2,
&local_error);
if (value == NULL)
{
g_variant_unref (key);
goto fail;
}
ret = g_variant_new_dict_entry (key, value);
g_variant_unref (key);
g_variant_unref (value);
}
}
else if (g_variant_type_is_tuple (type))
{
ensure_input_padding (buf, 8);
#ifdef DEBUG_SERIALIZER
is_leaf = FALSE;
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);
if (!element_type)
{
g_variant_builder_clear (&builder);
g_set_error_literal (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Empty structures (tuples) are not allowed in D-Bus"));
goto fail;
}
while (element_type != NULL)
{
GVariant *item;
item = parse_value_from_blob (buf,
element_type,
max_depth - 1,
FALSE,
indent + 2,
&local_error);
if (item == NULL)
{
g_variant_builder_clear (&builder);
goto fail;
}
g_variant_builder_add_value (&builder, item);
g_variant_unref (item);
element_type = g_variant_type_next (element_type);
}
ret = g_variant_builder_end (&builder);
}
}
else if (g_variant_type_is_variant (type))
{
#ifdef DEBUG_SERIALIZER
is_leaf = FALSE;
g_print ("\n");
#endif /* DEBUG_SERIALIZER */
if (!just_align)
{
guchar siglen;
const gchar *sig;
GVariantType *variant_type;
GVariant *value;
siglen = g_memory_buffer_read_byte (buf, &local_error);
if (local_error)
goto fail;
sig = read_string (buf, (gsize) siglen, &local_error);
if (sig == NULL)
goto fail;
if (!g_variant_is_signature (sig) ||
!g_variant_type_string_is_valid (sig))
{
/* A D-Bus signature can contain zero or more complete types,
* but a GVariant has to be exactly one complete type. */
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);
goto fail;
}
if (max_depth <= g_variant_type_string_get_depth_ (sig))
{
/* Catch the type nesting being too deep without having to
* parse the data. We don’t have to check this for static
* container types (like arrays and tuples, above) because
* the g_variant_type_string_is_valid() check performed before
* the initial parse_value_from_blob() call should check the
* static type nesting. */
g_set_error_literal (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Value nested too deeply"));
goto fail;
}
variant_type = g_variant_type_new (sig);
value = parse_value_from_blob (buf,
variant_type,
max_depth - 1,
FALSE,
indent + 2,
&local_error);
g_variant_type_free (variant_type);
if (value == NULL)
goto fail;
ret = g_variant_new_variant (value);
g_variant_unref (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;
}
break;
}
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 */
/* sink the reference, if floating */
if (ret != NULL)
g_variant_take_ref (ret);
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: (array length=blob_len) (element-type guint8): A blob representing 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 > (1<<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: (array length=blob_len) (element-type guint8): A blob representing 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. The byte
* order that the message was in can be retrieved using
* g_dbus_message_get_byte_order().
*
* If the @blob cannot be parsed, contains invalid fields, or contains invalid
* headers, %G_IO_ERROR_INVALID_ARGUMENT will be returned.
*
* 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)
{
GError *local_error = NULL;
GMemoryBuffer mbuf;
GDBusMessage *message;
guchar endianness;
guchar major_protocol_version;
guint32 message_body_len;
GVariant *headers;
GVariant *item;
GVariantIter iter;
GVariant *signature;
/* TODO: check against @capabilities */
g_return_val_if_fail (blob != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
message = g_dbus_message_new ();
memset (&mbuf, 0, sizeof (mbuf));
mbuf.data = (gchar *)blob;
mbuf.len = mbuf.valid_len = blob_len;
endianness = g_memory_buffer_read_byte (&mbuf, &local_error);
if (local_error)
goto fail;
switch (endianness)
{
case 'l':
mbuf.byte_order = G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN;
message->byte_order = G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN;
break;
case 'B':
mbuf.byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
message->byte_order = G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN;
break;
default:
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Invalid endianness value. Expected 0x6c (“l”) or 0x42 (“B”) but found value 0x%02x"),
endianness);
goto fail;
}
message->type = g_memory_buffer_read_byte (&mbuf, &local_error);
if (local_error)
goto fail;
message->flags = g_memory_buffer_read_byte (&mbuf, &local_error);
if (local_error)
goto fail;
major_protocol_version = g_memory_buffer_read_byte (&mbuf, &local_error);
if (local_error)
goto fail;
if (major_protocol_version != 1)
{
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Invalid major protocol version. Expected 1 but found %d"),
major_protocol_version);
goto fail;
}
message_body_len = g_memory_buffer_read_uint32 (&mbuf, &local_error);
if (local_error)
goto fail;
message->serial = g_memory_buffer_read_uint32 (&mbuf, &local_error);
if (local_error)
goto fail;
#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 (&mbuf,
G_VARIANT_TYPE ("a{yv}"),
G_DBUS_MAX_TYPE_DEPTH + 2 /* for the a{yv} */,
FALSE,
2,
&local_error);
if (headers == NULL)
goto fail;
g_variant_iter_init (&iter, headers);
while ((item = g_variant_iter_next_value (&iter)) != NULL)
{
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 (value);
g_variant_unref (item);
}
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;
if (!g_variant_is_of_type (signature, G_VARIANT_TYPE_SIGNATURE))
{
g_set_error_literal (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Signature header found but is not of type signature"));
goto fail;
}
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 (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Signature header with signature “%s” found but message body is empty"),
signature_str);
goto fail;
}
else if (signature_str_len > 0)
{
GVariantType *variant_type;
gchar *tupled_signature_str = g_strdup_printf ("(%s)", signature_str);
if (!g_variant_is_signature (signature_str) ||
!g_variant_type_string_is_valid (tupled_signature_str))
{
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Parsed value “%s” is not a valid D-Bus signature (for body)"),
signature_str);
g_free (tupled_signature_str);
goto fail;
}
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->body = parse_value_from_blob (&mbuf,
variant_type,
G_DBUS_MAX_TYPE_DEPTH + 1 /* for the surrounding tuple */,
FALSE,
2,
&local_error);
g_variant_type_free (variant_type);
if (message->body != NULL &&
g_variant_is_of_type (message->body, G_VARIANT_TYPE_TUPLE) &&
g_variant_n_children (message->body) > 0)
message->arg0_cache = g_variant_get_child_value (message->body, 0);
else
message->arg0_cache = NULL;
if (message->body == NULL)
goto fail;
}
}
else
{
/* no signature, this is only OK if the body is empty */
if (message_body_len != 0)
{
/* G_GUINT32_FORMAT doesn't work with gettext, just use %u */
g_set_error (&local_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
g_dngettext (GETTEXT_PACKAGE,
"No signature header in message but the message body is %u byte",
"No signature header in message but the message body is %u bytes",
message_body_len),
message_body_len);
goto fail;
}
}
if (!validate_headers (message, &local_error))
{
g_prefix_error (&local_error, _("Cannot deserialize message: "));
goto fail;
}
return message;
fail:
g_clear_object (&message);
g_propagate_error (error, local_error);
return NULL;
}
/* ---------------------------------------------------------------------------------------------------- */
static gsize
ensure_output_padding (GMemoryBuffer *mbuf,
gsize padding_size)
{
gsize offset;
gsize wanted_offset;
gsize padding_needed;
guint n;
offset = mbuf->pos;
wanted_offset = ((offset + padding_size - 1) / padding_size) * padding_size;
padding_needed = wanted_offset - offset;
for (n = 0; n < padding_needed; n++)
g_memory_buffer_put_byte (mbuf, '\0');
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,
GMemoryBuffer *mbuf,
gsize *out_padding_added,
GError **error)
{
gsize padding_added;
const gchar *type_string;
type_string = g_variant_type_peek_string (type);
padding_added = 0;
switch (type_string[0])
{
case 'b': /* G_VARIANT_TYPE_BOOLEAN */
padding_added = ensure_output_padding (mbuf, 4);
if (value != NULL)
{
gboolean v = g_variant_get_boolean (value);
g_memory_buffer_put_uint32 (mbuf, v);
}
break;
case 'y': /* G_VARIANT_TYPE_BYTE */
if (value != NULL)
{
guint8 v = g_variant_get_byte (value);
g_memory_buffer_put_byte (mbuf, v);
}
break;
case 'n': /* G_VARIANT_TYPE_INT16 */
padding_added = ensure_output_padding (mbuf, 2);
if (value != NULL)
{
gint16 v = g_variant_get_int16 (value);
g_memory_buffer_put_int16 (mbuf, v);
}
break;
case 'q': /* G_VARIANT_TYPE_UINT16 */
padding_added = ensure_output_padding (mbuf, 2);
if (value != NULL)
{
guint16 v = g_variant_get_uint16 (value);
g_memory_buffer_put_uint16 (mbuf, v);
}
break;
case 'i': /* G_VARIANT_TYPE_INT32 */
padding_added = ensure_output_padding (mbuf, 4);
if (value != NULL)
{
gint32 v = g_variant_get_int32 (value);
g_memory_buffer_put_int32 (mbuf, v);
}
break;
case 'u': /* G_VARIANT_TYPE_UINT32 */
padding_added = ensure_output_padding (mbuf, 4);
if (value != NULL)
{
guint32 v = g_variant_get_uint32 (value);
g_memory_buffer_put_uint32 (mbuf, v);
}
break;
case 'x': /* G_VARIANT_TYPE_INT64 */
padding_added = ensure_output_padding (mbuf, 8);
if (value != NULL)
{
gint64 v = g_variant_get_int64 (value);
g_memory_buffer_put_int64 (mbuf, v);
}
break;
case 't': /* G_VARIANT_TYPE_UINT64 */
padding_added = ensure_output_padding (mbuf, 8);
if (value != NULL)
{
guint64 v = g_variant_get_uint64 (value);
g_memory_buffer_put_uint64 (mbuf, v);
}
break;
case 'd': /* G_VARIANT_TYPE_DOUBLE */
padding_added = ensure_output_padding (mbuf, 8);
if (value != NULL)
{
union {
guint64 v_uint64;
gdouble v_double;
} u;
G_STATIC_ASSERT (sizeof (gdouble) == sizeof (guint64));
u.v_double = g_variant_get_double (value);
g_memory_buffer_put_uint64 (mbuf, u.v_uint64);
}
break;
case 's': /* G_VARIANT_TYPE_STRING */
padding_added = ensure_output_padding (mbuf, 4);
if (value != NULL)
{
gsize len;
const gchar *v;
#ifndef G_DISABLE_ASSERT
const gchar *end;
#endif
v = g_variant_get_string (value, &len);
g_assert (g_utf8_validate (v, -1, &end) && (end == v + len));
g_memory_buffer_put_uint32 (mbuf, len);
g_memory_buffer_put_string (mbuf, v);
g_memory_buffer_put_byte (mbuf, '\0');
}
break;
case 'o': /* G_VARIANT_TYPE_OBJECT_PATH */
padding_added = ensure_output_padding (mbuf, 4);
if (value != NULL)
{
gsize len;
const gchar *v = g_variant_get_string (value, &len);
g_assert (g_variant_is_object_path (v));
g_memory_buffer_put_uint32 (mbuf, len);
g_memory_buffer_put_string (mbuf, v);
g_memory_buffer_put_byte (mbuf, '\0');
}
break;
case 'g': /* G_VARIANT_TYPE_SIGNATURE */
if (value != NULL)
{
gsize len;
const gchar *v = g_variant_get_string (value, &len);
g_assert (g_variant_is_signature (v));
g_memory_buffer_put_byte (mbuf, len);
g_memory_buffer_put_string (mbuf, v);
g_memory_buffer_put_byte (mbuf, '\0');
}
break;
case 'h': /* G_VARIANT_TYPE_HANDLE */
padding_added = ensure_output_padding (mbuf, 4);
if (value != NULL)
{
gint32 v = g_variant_get_handle (value);
g_memory_buffer_put_int32 (mbuf, v);
}
break;
case 'a': /* G_VARIANT_TYPE_ARRAY */
{
const GVariantType *element_type;
GVariant *item;
GVariantIter iter;
goffset array_len_offset;
goffset array_payload_begin_offset;
goffset cur_offset;
gsize array_len;
guint fixed_size;
padding_added = ensure_output_padding (mbuf, 4);
if (value != NULL)
{
/* array length - will be filled in later */
array_len_offset = mbuf->valid_len;
g_memory_buffer_put_uint32 (mbuf, 0xF00DFACE);
/* 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 = mbuf->valid_len;
element_type = g_variant_type_element (type);
fixed_size = get_type_fixed_size (element_type);
if (g_variant_n_children (value) == 0)
{
gsize padding_added_for_item;
if (!append_value_to_blob (NULL,
element_type,
mbuf,
&padding_added_for_item,
error))
goto fail;
array_payload_begin_offset += padding_added_for_item;
}
else if (fixed_size != 0)
{
GVariant *use_value;
if (g_memory_buffer_is_byteswapped (mbuf))
use_value = g_variant_byteswap (value);
else
use_value = g_variant_ref (value);
array_payload_begin_offset += ensure_output_padding (mbuf, fixed_size);
array_len = g_variant_get_size (use_value);
g_memory_buffer_write (mbuf, g_variant_get_data (use_value), array_len);
g_variant_unref (use_value);
}
else
{
guint n;
n = 0;
g_variant_iter_init (&iter, value);
while ((item = g_variant_iter_next_value (&iter)) != NULL)
{
gsize padding_added_for_item;
if (!append_value_to_blob (item,
g_variant_get_type (item),
mbuf,
&padding_added_for_item,
error))
{
g_variant_unref (item);
goto fail;
}
g_variant_unref (item);
if (n == 0)
{
array_payload_begin_offset += padding_added_for_item;
}
n++;
}
}
cur_offset = mbuf->valid_len;
array_len = cur_offset - array_payload_begin_offset;
mbuf->pos = array_len_offset;
g_memory_buffer_put_uint32 (mbuf, array_len);
mbuf->pos = cur_offset;
}
}
break;
default:
if (g_variant_type_is_dict_entry (type) || g_variant_type_is_tuple (type))
{
if (!g_variant_type_first (type))
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Empty structures (tuples) are not allowed in D-Bus"));
goto fail;
}
padding_added = ensure_output_padding (mbuf, 8);
if (value != NULL)
{
GVariant *item;
GVariantIter iter;
g_variant_iter_init (&iter, value);
while ((item = g_variant_iter_next_value (&iter)) != NULL)
{
if (!append_value_to_blob (item,
g_variant_get_type (item),
mbuf,
NULL,
error))
{
g_variant_unref (item);
goto fail;
}
g_variant_unref (item);
}
}
}
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);
g_memory_buffer_put_byte (mbuf, strlen (signature));
g_memory_buffer_put_string (mbuf, signature);
g_memory_buffer_put_byte (mbuf, '\0');
if (!append_value_to_blob (child,
g_variant_get_type (child),
mbuf,
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;
}
break;
}
if (out_padding_added != NULL)
*out_padding_added = padding_added;
return TRUE;
fail:
return FALSE;
}
static gboolean
append_body_to_blob (GVariant *value,
GMemoryBuffer *mbuf,
GError **error)
{
GVariant *item;
GVariantIter iter;
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)) != NULL)
{
if (!append_value_to_blob (item,
g_variant_get_type (item),
mbuf,
NULL,
error))
{
g_variant_unref (item);
goto fail;
}
g_variant_unref (item);
}
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. The byte order returned by
* g_dbus_message_get_byte_order() will be used.
*
* Returns: (array length=out_size) (transfer full): 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)
{
GMemoryBuffer mbuf;
guchar *ret;
gsize size;
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);
memset (&mbuf, 0, sizeof (mbuf));
mbuf.len = MIN_ARRAY_SIZE;
mbuf.data = g_malloc (mbuf.len);
mbuf.byte_order = G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN;
switch (message->byte_order)
{
case G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN:
mbuf.byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
break;
case G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN:
mbuf.byte_order = G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN;
break;
}
/* Core header */
g_memory_buffer_put_byte (&mbuf, (guchar) message->byte_order);
g_memory_buffer_put_byte (&mbuf, message->type);
g_memory_buffer_put_byte (&mbuf, message->flags);
g_memory_buffer_put_byte (&mbuf, 1); /* major protocol version */
body_len_offset = mbuf.valid_len;
/* body length - will be filled in later */
g_memory_buffer_put_uint32 (&mbuf, 0xF00DFACE);
g_memory_buffer_put_uint32 (&mbuf, message->serial);
num_fds_in_message = 0;
#ifdef G_OS_UNIX
if (message->fd_list != NULL)
num_fds_in_message = g_unix_fd_list_get_length (message->fd_list);
#endif
num_fds_according_to_header = g_dbus_message_get_num_unix_fds (message);
if (num_fds_in_message != num_fds_according_to_header)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Number of file descriptors in message (%d) differs from header field (%d)"),
num_fds_in_message,
num_fds_according_to_header);
goto out;
}
if (!validate_headers (message, error))
{
g_prefix_error (error, _("Cannot serialize message: "));
goto out;
}
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{yv}"));
g_hash_table_iter_init (&hash_iter, message->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),
&mbuf,
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 (&mbuf, 8);
body_start_offset = mbuf.valid_len;
signature = g_dbus_message_get_header (message, G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE);
if (signature != NULL && !g_variant_is_of_type (signature, G_VARIANT_TYPE_SIGNATURE))
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Signature header found but is not of type signature"));
goto out;
}
signature_str = NULL;
if (signature != NULL)
signature_str = g_variant_get_string (signature, NULL);
if (message->body != NULL)
{
gchar *tupled_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"),
g_variant_get_type_string (message->body));
goto out;
}
tupled_signature_str = g_strdup_printf ("(%s)", signature_str);
if (g_strcmp0 (tupled_signature_str, g_variant_get_type_string (message->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”"),
g_variant_get_type_string (message->body), tupled_signature_str);
g_free (tupled_signature_str);
goto out;
}
g_free (tupled_signature_str);
if (!append_body_to_blob (message->body, &mbuf, error))
goto out;
}
else
{
if (signature != NULL && strlen (signature_str) > 0)
{
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 = mbuf.valid_len;
body_size = size - body_start_offset;
mbuf.pos = body_len_offset;
g_memory_buffer_put_uint32 (&mbuf, body_size);
*out_size = size;
ret = (guchar *)mbuf.data;
out:
if (ret == NULL)
g_free (mbuf.data);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static guint32
get_uint32_header (GDBusMessage *message,
GDBusMessageHeaderField header_field)
{
GVariant *value;
guint32 ret;
ret = 0;
value = g_hash_table_lookup (message->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->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->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->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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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: (nullable): 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_error_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.
*
* This will always be non-%NULL, but may be an empty string.
*
* Returns: (not nullable): 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: (nullable): 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.
*
* See [method@Gio.DBusMessage.get_arg0_path] for returning object-path-typed
* arg0 values.
*
* Returns: (nullable): 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)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
if (message->arg0_cache != NULL &&
g_variant_is_of_type (message->arg0_cache, G_VARIANT_TYPE_STRING))
return g_variant_get_string (message->arg0_cache, NULL);
return NULL;
}
/**
* g_dbus_message_get_arg0_path:
* @message: A `GDBusMessage`.
*
* Convenience to get the first item in the body of @message.
*
* See [method@Gio.DBusMessage.get_arg0] for returning string-typed arg0 values.
*
* Returns: (nullable): The object path item or `NULL` if the first item in the
* body of @message is not an object path.
*
* Since: 2.80
*/
const gchar *
g_dbus_message_get_arg0_path (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
if (message->arg0_cache != NULL &&
g_variant_is_of_type (message->arg0_cache, G_VARIANT_TYPE_OBJECT_PATH))
return g_variant_get_string (message->arg0_cache, NULL);
return NULL;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* 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->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
{
/* TODO: 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 *
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:
* ```
* 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)
* ```
* or
* ```
* 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
* ```
*
* Returns: (not nullable): A string that should be freed with [func@GLib.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 = _g_dbus_enum_to_string (G_TYPE_DBUS_MESSAGE_TYPE, message->type);
g_string_append_printf (str, "%*sType: %s\n", indent, "", s);
g_free (s);
s = flags_to_string (G_TYPE_DBUS_MESSAGE_FLAGS, message->flags);
g_string_append_printf (str, "%*sFlags: %s\n", indent, "", s);
g_free (s);
g_string_append_printf (str, "%*sVersion: %d\n", indent, "", message->major_protocol_version);
g_string_append_printf (str, "%*sSerial: %d\n", indent, "", message->serial);
g_string_append_printf (str, "%*sHeaders:\n", indent, "");
keys = g_hash_table_get_keys (message->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->headers, l->data);
g_assert (value != NULL);
s = _g_dbus_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_list_free (keys);
g_string_append_printf (str, "%*sBody: ", indent, "");
if (message->body != NULL)
{
g_variant_print_string (message->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->fd_list != NULL)
{
gint num_fds;
const gint *fds;
gint n;
fds = g_unix_fd_list_peek_fds (message->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)
{
#ifndef MAJOR_MINOR_NOT_FOUND
g_string_append_printf (fs, "%s" "dev=%d:%d", fs->len > 0 ? "," : "",
(gint) major (statbuf.st_dev), (gint) minor (statbuf.st_dev));
#endif
g_string_append_printf (fs, "%s" "mode=0%o", fs->len > 0 ? "," : "",
(guint) 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=%u", fs->len > 0 ? "," : "",
(guint) statbuf.st_uid);
g_string_append_printf (fs, "%s" "gid=%u", fs->len > 0 ? "," : "",
(guint) statbuf.st_gid);
#ifndef MAJOR_MINOR_NOT_FOUND
g_string_append_printf (fs, "%s" "rdev=%d:%d", fs->len > 0 ? "," : "",
(gint) major (statbuf.st_rdev), (gint) minor (statbuf.st_rdev));
#endif
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
{
int errsv = errno;
g_string_append_printf (fs, "(fstat failed: %s)", g_strerror (errsv));
}
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);
}
/**
* g_dbus_message_get_locked:
* @message: A #GDBusMessage.
*
* Checks whether @message is locked. To monitor changes to this
* value, conncet to the #GObject::notify signal to listen for changes
* on the #GDBusMessage:locked property.
*
* Returns: %TRUE if @message is locked, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_message_get_locked (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
return message->locked;
}
/**
* g_dbus_message_lock:
* @message: A #GDBusMessage.
*
* If @message is locked, does nothing. Otherwise locks the message.
*
* Since: 2.26
*/
void
g_dbus_message_lock (GDBusMessage *message)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
if (message->locked)
goto out;
message->locked = TRUE;
g_object_notify (G_OBJECT (message), "locked");
out:
;
}
/**
* g_dbus_message_copy:
* @message: A #GDBusMessage.
* @error: Return location for error or %NULL.
*
* Copies @message. The copy is a deep copy and the returned
* #GDBusMessage is completely identical except that it is guaranteed
* to not be locked.
*
* This operation can fail if e.g. @message contains file descriptors
* and the per-process or system-wide open files limit is reached.
*
* Returns: (transfer full): A new #GDBusMessage or %NULL if @error is set.
* Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_message_copy (GDBusMessage *message,
GError **error)
{
GDBusMessage *ret;
GHashTableIter iter;
gpointer header_key;
GVariant *header_value;
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
ret = g_dbus_message_new ();
ret->type = message->type;
ret->flags = message->flags;
ret->byte_order = message->byte_order;
ret->major_protocol_version = message->major_protocol_version;
ret->serial = message->serial;
#ifdef G_OS_UNIX
if (message->fd_list != NULL)
{
gint n;
gint num_fds;
const gint *fds;
ret->fd_list = g_unix_fd_list_new ();
fds = g_unix_fd_list_peek_fds (message->fd_list, &num_fds);
for (n = 0; n < num_fds; n++)
{
if (g_unix_fd_list_append (ret->fd_list,
fds[n],
error) == -1)
{
g_object_unref (ret);
ret = NULL;
goto out;
}
}
}
#endif
/* see https://bugzilla.gnome.org/show_bug.cgi?id=624546#c8 for why it's fine
* to just ref (as opposed to deep-copying) the GVariant instances
*/
ret->body = message->body != NULL ? g_variant_ref (message->body) : NULL;
ret->arg0_cache = message->arg0_cache != NULL ? g_variant_ref (message->arg0_cache) : NULL;
g_hash_table_iter_init (&iter, message->headers);
while (g_hash_table_iter_next (&iter, &header_key, (gpointer) &header_value))
g_hash_table_insert (ret->headers, header_key, g_variant_ref (header_value));
#ifdef G_OS_UNIX
out:
#endif
return ret;
}
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