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

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

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

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

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

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "giotypes.h"
#include "gsocket.h"
#include "gdbusprivate.h"
#include "gdbusmessage.h"
#include "gdbuserror.h"
#include "gdbusintrospection.h"
#include "gasyncresult.h"
#include "gsimpleasyncresult.h"
#include "ginputstream.h"
#include "giostream.h"
#include "gsocketcontrolmessage.h"
#include "gsocketconnection.h"
#ifdef G_OS_UNIX
#include "gunixfdmessage.h"
#include "gunixconnection.h"
#include "gunixcredentialsmessage.h"
#endif
#ifdef G_OS_WIN32
#include <windows.h>
#endif
#include "glibintl.h"
#include "gioalias.h"
/* ---------------------------------------------------------------------------------------------------- */
gchar *
_g_dbus_hexdump (const gchar *data, gsize len, guint indent)
{
guint n, m;
GString *ret;
ret = g_string_new (NULL);
for (n = 0; n < len; n += 16)
{
g_string_append_printf (ret, "%*s%04x: ", indent, "", n);
for (m = n; m < n + 16; m++)
{
if (m > n && (m%4) == 0)
g_string_append_c (ret, ' ');
if (m < len)
g_string_append_printf (ret, "%02x ", (guchar) data[m]);
else
g_string_append (ret, " ");
}
g_string_append (ret, " ");
for (m = n; m < len && m < n + 16; m++)
g_string_append_c (ret, g_ascii_isprint (data[m]) ? data[m] : '.');
g_string_append_c (ret, '\n');
}
return g_string_free (ret, FALSE);
}
/* ---------------------------------------------------------------------------------------------------- */
/* Unfortunately ancillary messages are discarded when reading from a
* socket using the GSocketInputStream abstraction. So we provide a
* very GInputStream-ish API that uses GSocket in this case (very
* similar to GSocketInputStream).
*/
typedef struct
{
GSocket *socket;
GCancellable *cancellable;
void *buffer;
gsize count;
GSocketControlMessage ***messages;
gint *num_messages;
GSimpleAsyncResult *simple;
gboolean from_mainloop;
} ReadWithControlData;
static void
read_with_control_data_free (ReadWithControlData *data)
{
g_object_unref (data->socket);
if (data->cancellable != NULL)
g_object_unref (data->cancellable);
g_free (data);
}
static gboolean
_g_socket_read_with_control_messages_ready (GSocket *socket,
GIOCondition condition,
gpointer user_data)
{
ReadWithControlData *data = user_data;
GError *error;
gssize result;
GInputVector vector;
error = NULL;
vector.buffer = data->buffer;
vector.size = data->count;
result = g_socket_receive_message (data->socket,
NULL, /* address */
&vector,
1,
data->messages,
data->num_messages,
NULL,
data->cancellable,
&error);
if (result >= 0)
{
g_simple_async_result_set_op_res_gssize (data->simple, result);
}
else
{
g_assert (error != NULL);
g_simple_async_result_set_from_error (data->simple, error);
g_error_free (error);
}
if (data->from_mainloop)
g_simple_async_result_complete (data->simple);
else
g_simple_async_result_complete_in_idle (data->simple);
return FALSE;
}
static void
_g_socket_read_with_control_messages (GSocket *socket,
void *buffer,
gsize count,
GSocketControlMessage ***messages,
gint *num_messages,
gint io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
ReadWithControlData *data;
data = g_new0 (ReadWithControlData, 1);
data->socket = g_object_ref (socket);
data->cancellable = cancellable != NULL ? g_object_ref (cancellable) : NULL;
data->buffer = buffer;
data->count = count;
data->messages = messages;
data->num_messages = num_messages;
data->simple = g_simple_async_result_new (G_OBJECT (socket),
callback,
user_data,
_g_socket_read_with_control_messages);
if (!g_socket_condition_check (socket, G_IO_IN))
{
GSource *source;
data->from_mainloop = TRUE;
source = g_socket_create_source (data->socket,
G_IO_IN | G_IO_HUP | G_IO_ERR,
cancellable);
g_source_set_callback (source,
(GSourceFunc) _g_socket_read_with_control_messages_ready,
data,
(GDestroyNotify) read_with_control_data_free);
g_source_attach (source, g_main_context_get_thread_default ());
g_source_unref (source);
}
else
{
_g_socket_read_with_control_messages_ready (data->socket, G_IO_IN, data);
read_with_control_data_free (data);
}
}
static gssize
_g_socket_read_with_control_messages_finish (GSocket *socket,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
g_return_val_if_fail (G_IS_SOCKET (socket), -1);
g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == _g_socket_read_with_control_messages);
if (g_simple_async_result_propagate_error (simple, error))
return -1;
else
return g_simple_async_result_get_op_res_gssize (simple);
}
/* ---------------------------------------------------------------------------------------------------- */
G_LOCK_DEFINE_STATIC (shared_thread_lock);
typedef struct
{
gint num_users;
GThread *thread;
GMainContext *context;
GMainLoop *loop;
} SharedThreadData;
static SharedThreadData *shared_thread_data = NULL;
static gpointer
shared_thread_func (gpointer data)
{
g_main_context_push_thread_default (shared_thread_data->context);
g_main_loop_run (shared_thread_data->loop);
g_main_context_pop_thread_default (shared_thread_data->context);
return NULL;
}
typedef void (*GDBusSharedThreadFunc) (gpointer user_data);
typedef struct
{
GDBusSharedThreadFunc func;
gpointer user_data;
gboolean done;
} CallerData;
static gboolean
invoke_caller (gpointer user_data)
{
CallerData *data = user_data;
data->func (data->user_data);
data->done = TRUE;
return FALSE;
}
static void
_g_dbus_shared_thread_ref (GDBusSharedThreadFunc func,
gpointer user_data)
{
GError *error;
GSource *idle_source;
CallerData *data;
G_LOCK (shared_thread_lock);
if (shared_thread_data != NULL)
{
shared_thread_data->num_users += 1;
goto have_thread;
}
shared_thread_data = g_new0 (SharedThreadData, 1);
shared_thread_data->num_users = 1;
error = NULL;
shared_thread_data->context = g_main_context_new ();
shared_thread_data->loop = g_main_loop_new (shared_thread_data->context, FALSE);
shared_thread_data->thread = g_thread_create (shared_thread_func,
NULL,
TRUE,
&error);
g_assert_no_error (error);
have_thread:
data = g_new0 (CallerData, 1);
data->func = func;
data->user_data = user_data;
data->done = FALSE;
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
invoke_caller,
data,
NULL);
g_source_attach (idle_source, shared_thread_data->context);
g_source_unref (idle_source);
/* wait for the user code to run.. hmm.. probably use a condition variable instead */
while (!data->done)
g_thread_yield ();
g_free (data);
G_UNLOCK (shared_thread_lock);
}
static void
_g_dbus_shared_thread_unref (void)
{
/* TODO: actually destroy the shared thread here */
#if 0
G_LOCK (shared_thread_lock);
g_assert (shared_thread_data != NULL);
shared_thread_data->num_users -= 1;
if (shared_thread_data->num_users == 0)
{
g_main_loop_quit (shared_thread_data->loop);
//g_thread_join (shared_thread_data->thread);
g_main_loop_unref (shared_thread_data->loop);
g_main_context_unref (shared_thread_data->context);
g_free (shared_thread_data);
shared_thread_data = NULL;
G_UNLOCK (shared_thread_lock);
}
else
{
G_UNLOCK (shared_thread_lock);
}
#endif
}
/* ---------------------------------------------------------------------------------------------------- */
struct GDBusWorker
{
volatile gint ref_count;
gboolean stopped;
GIOStream *stream;
GDBusCapabilityFlags capabilities;
GCancellable *cancellable;
GDBusWorkerMessageReceivedCallback message_received_callback;
GDBusWorkerDisconnectedCallback disconnected_callback;
gpointer user_data;
GThread *thread;
/* if not NULL, stream is GSocketConnection */
GSocket *socket;
/* used for reading */
GMutex *read_lock;
gchar *read_buffer;
gsize read_buffer_allocated_size;
gsize read_buffer_cur_size;
gsize read_buffer_bytes_wanted;
GUnixFDList *read_fd_list;
GSocketControlMessage **read_ancillary_messages;
gint read_num_ancillary_messages;
/* used for writing */
GMutex *write_lock;
GQueue *write_queue;
gboolean write_is_pending;
};
struct _MessageToWriteData ;
typedef struct _MessageToWriteData MessageToWriteData;
static void message_to_write_data_free (MessageToWriteData *data);
static GDBusWorker *
_g_dbus_worker_ref (GDBusWorker *worker)
{
g_atomic_int_inc (&worker->ref_count);
return worker;
}
static void
_g_dbus_worker_unref (GDBusWorker *worker)
{
if (g_atomic_int_dec_and_test (&worker->ref_count))
{
_g_dbus_shared_thread_unref ();
g_object_unref (worker->stream);
g_mutex_free (worker->read_lock);
g_object_unref (worker->cancellable);
if (worker->read_fd_list != NULL)
g_object_unref (worker->read_fd_list);
g_mutex_free (worker->write_lock);
g_queue_foreach (worker->write_queue,
(GFunc) message_to_write_data_free,
NULL);
g_queue_free (worker->write_queue);
g_free (worker);
}
}
static void
_g_dbus_worker_emit_disconnected (GDBusWorker *worker,
gboolean remote_peer_vanished,
GError *error)
{
if (!worker->stopped)
worker->disconnected_callback (worker, remote_peer_vanished, error, worker->user_data);
}
static void
_g_dbus_worker_emit_message (GDBusWorker *worker,
GDBusMessage *message)
{
if (!worker->stopped)
worker->message_received_callback (worker, message, worker->user_data);
}
static void _g_dbus_worker_do_read_unlocked (GDBusWorker *worker);
/* called in private thread shared by all GDBusConnection instances (without read-lock held) */
static void
_g_dbus_worker_do_read_cb (GInputStream *input_stream,
GAsyncResult *res,
gpointer user_data)
{
GDBusWorker *worker = user_data;
GError *error;
gssize bytes_read;
g_mutex_lock (worker->read_lock);
/* If already stopped, don't even process the reply */
if (worker->stopped)
goto out;
error = NULL;
if (worker->socket == NULL)
bytes_read = g_input_stream_read_finish (g_io_stream_get_input_stream (worker->stream),
res,
&error);
else
bytes_read = _g_socket_read_with_control_messages_finish (worker->socket,
res,
&error);
if (worker->read_num_ancillary_messages > 0)
{
gint n;
for (n = 0; n < worker->read_num_ancillary_messages; n++)
{
GSocketControlMessage *control_message = G_SOCKET_CONTROL_MESSAGE (worker->read_ancillary_messages[n]);
if (FALSE)
{
}
#ifdef G_OS_UNIX
else if (G_IS_UNIX_FD_MESSAGE (control_message))
{
GUnixFDMessage *fd_message;
gint *fds;
gint num_fds;
fd_message = G_UNIX_FD_MESSAGE (control_message);
fds = g_unix_fd_message_steal_fds (fd_message, &num_fds);
if (worker->read_fd_list == NULL)
{
worker->read_fd_list = g_unix_fd_list_new_from_array (fds, num_fds);
}
else
{
gint n;
for (n = 0; n < num_fds; n++)
{
/* TODO: really want a append_steal() */
g_unix_fd_list_append (worker->read_fd_list, fds[n], NULL);
close (fds[n]);
}
}
g_free (fds);
}
else if (G_IS_UNIX_CREDENTIALS_MESSAGE (control_message))
{
/* do nothing */
}
#endif
else
{
if (error == NULL)
{
g_set_error (&error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"Unexpected ancillary message of type %s received from peer",
g_type_name (G_TYPE_FROM_INSTANCE (control_message)));
_g_dbus_worker_emit_disconnected (worker, TRUE, error);
g_error_free (error);
g_object_unref (control_message);
n++;
while (n < worker->read_num_ancillary_messages)
g_object_unref (worker->read_ancillary_messages[n++]);
g_free (worker->read_ancillary_messages);
goto out;
}
}
g_object_unref (control_message);
}
g_free (worker->read_ancillary_messages);
}
if (bytes_read == -1)
{
_g_dbus_worker_emit_disconnected (worker, TRUE, error);
g_error_free (error);
goto out;
}
#if 0
g_debug ("read %d bytes (is_closed=%d blocking=%d condition=0x%02x) stream %p, %p",
(gint) bytes_read,
g_socket_is_closed (g_socket_connection_get_socket (G_SOCKET_CONNECTION (worker->stream))),
g_socket_get_blocking (g_socket_connection_get_socket (G_SOCKET_CONNECTION (worker->stream))),
g_socket_condition_check (g_socket_connection_get_socket (G_SOCKET_CONNECTION (worker->stream)),
G_IO_IN | G_IO_OUT | G_IO_HUP),
worker->stream,
worker);
#endif
/* TODO: hmm, hmm... */
if (bytes_read == 0)
{
g_set_error (&error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"Underlying GIOStream returned 0 bytes on an async read");
_g_dbus_worker_emit_disconnected (worker, TRUE, error);
g_error_free (error);
goto out;
}
worker->read_buffer_cur_size += bytes_read;
if (worker->read_buffer_bytes_wanted == worker->read_buffer_cur_size)
{
/* OK, got what we asked for! */
if (worker->read_buffer_bytes_wanted == 16)
{
gssize message_len;
/* OK, got the header - determine how many more bytes are needed */
error = NULL;
message_len = g_dbus_message_bytes_needed ((guchar *) worker->read_buffer,
16,
&error);
if (message_len == -1)
{
g_warning ("_g_dbus_worker_do_read_cb: error determing bytes needed: %s", error->message);
_g_dbus_worker_emit_disconnected (worker, FALSE, error);
g_error_free (error);
goto out;
}
worker->read_buffer_bytes_wanted = message_len;
_g_dbus_worker_do_read_unlocked (worker);
}
else
{
GDBusMessage *message;
error = NULL;
/* TODO: use connection->priv->auth to decode the message */
message = g_dbus_message_new_from_blob ((guchar *) worker->read_buffer,
worker->read_buffer_cur_size,
worker->capabilities,
&error);
if (message == NULL)
{
gchar *s;
s = _g_dbus_hexdump (worker->read_buffer, worker->read_buffer_cur_size, 2);
g_warning ("Error decoding D-Bus message of %" G_GSIZE_FORMAT " bytes\n"
"The error is: %s\n"
"The payload is as follows:\n"
"%s\n",
worker->read_buffer_cur_size,
error->message,
s);
g_free (s);
_g_dbus_worker_emit_disconnected (worker, FALSE, error);
g_error_free (error);
goto out;
}
#ifdef G_OS_UNIX
if (worker->read_fd_list != NULL)
{
g_dbus_message_set_unix_fd_list (message, worker->read_fd_list);
worker->read_fd_list = NULL;
}
#endif
if (G_UNLIKELY (_g_dbus_debug_message ()))
{
gchar *s;
g_print ("========================================================================\n"
"GDBus-debug:Message:\n"
" <<<< RECEIVED D-Bus message (%" G_GSIZE_FORMAT " bytes)\n",
worker->read_buffer_cur_size);
s = g_dbus_message_print (message, 2);
g_print ("%s", s);
g_free (s);
s = _g_dbus_hexdump (worker->read_buffer, worker->read_buffer_cur_size, 2);
g_print ("%s\n", s);
g_free (s);
}
/* yay, got a message, go deliver it */
_g_dbus_worker_emit_message (worker, message);
g_object_unref (message);
/* start reading another message! */
worker->read_buffer_bytes_wanted = 0;
worker->read_buffer_cur_size = 0;
_g_dbus_worker_do_read_unlocked (worker);
}
}
else
{
/* didn't get all the bytes we requested - so repeat the request... */
_g_dbus_worker_do_read_unlocked (worker);
}
out:
g_mutex_unlock (worker->read_lock);
/* gives up the reference acquired when calling g_input_stream_read_async() */
_g_dbus_worker_unref (worker);
}
/* called in private thread shared by all GDBusConnection instances (with read-lock held) */
static void
_g_dbus_worker_do_read_unlocked (GDBusWorker *worker)
{
/* if bytes_wanted is zero, it means start reading a message */
if (worker->read_buffer_bytes_wanted == 0)
{
worker->read_buffer_cur_size = 0;
worker->read_buffer_bytes_wanted = 16;
}
/* ensure we have a (big enough) buffer */
if (worker->read_buffer == NULL || worker->read_buffer_bytes_wanted > worker->read_buffer_allocated_size)
{
/* TODO: 4096 is randomly chosen; might want a better chosen default minimum */
worker->read_buffer_allocated_size = MAX (worker->read_buffer_bytes_wanted, 4096);
worker->read_buffer = g_realloc (worker->read_buffer, worker->read_buffer_allocated_size);
}
if (worker->socket == NULL)
g_input_stream_read_async (g_io_stream_get_input_stream (worker->stream),
worker->read_buffer + worker->read_buffer_cur_size,
worker->read_buffer_bytes_wanted - worker->read_buffer_cur_size,
G_PRIORITY_DEFAULT,
worker->cancellable,
(GAsyncReadyCallback) _g_dbus_worker_do_read_cb,
_g_dbus_worker_ref (worker));
else
{
worker->read_ancillary_messages = NULL;
worker->read_num_ancillary_messages = 0;
_g_socket_read_with_control_messages (worker->socket,
worker->read_buffer + worker->read_buffer_cur_size,
worker->read_buffer_bytes_wanted - worker->read_buffer_cur_size,
&worker->read_ancillary_messages,
&worker->read_num_ancillary_messages,
G_PRIORITY_DEFAULT,
worker->cancellable,
(GAsyncReadyCallback) _g_dbus_worker_do_read_cb,
_g_dbus_worker_ref (worker));
}
}
/* called in private thread shared by all GDBusConnection instances (without read-lock held) */
static void
_g_dbus_worker_do_read (GDBusWorker *worker)
{
g_mutex_lock (worker->read_lock);
_g_dbus_worker_do_read_unlocked (worker);
g_mutex_unlock (worker->read_lock);
}
/* ---------------------------------------------------------------------------------------------------- */
struct _MessageToWriteData
{
GDBusMessage *message;
gchar *blob;
gsize blob_size;
};
static void
message_to_write_data_free (MessageToWriteData *data)
{
g_object_unref (data->message);
g_free (data->blob);
g_free (data);
}
/* ---------------------------------------------------------------------------------------------------- */
/* called in private thread shared by all GDBusConnection instances (with write-lock held) */
static gboolean
write_message (GDBusWorker *worker,
MessageToWriteData *data,
GError **error)
{
gboolean ret;
g_return_val_if_fail (data->blob_size > 16, FALSE);
ret = FALSE;
/* First, the initial 16 bytes - special case UNIX sockets here
* since it may involve writing an ancillary message with file
* descriptors
*/
#ifdef G_OS_UNIX
{
GOutputVector vector;
GSocketControlMessage *message;
GUnixFDList *fd_list;
gssize bytes_written;
fd_list = g_dbus_message_get_unix_fd_list (data->message);
message = NULL;
if (fd_list != NULL)
{
if (!G_IS_UNIX_CONNECTION (worker->stream))
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Tried sending a file descriptor on unsupported stream of type %s",
g_type_name (G_TYPE_FROM_INSTANCE (worker->stream)));
goto out;
}
else if (!(worker->capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING))
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Tried sending a file descriptor but remote peer does not support this capability");
goto out;
}
message = g_unix_fd_message_new_with_fd_list (fd_list);
}
vector.buffer = data->blob;
vector.size = 16;
bytes_written = g_socket_send_message (worker->socket,
NULL, /* address */
&vector,
1,
message != NULL ? &message : NULL,
message != NULL ? 1 : 0,
G_SOCKET_MSG_NONE,
worker->cancellable,
error);
if (bytes_written == -1)
{
g_prefix_error (error, _("Error writing first 16 bytes of message to socket: "));
if (message != NULL)
g_object_unref (message);
goto out;
}
if (message != NULL)
g_object_unref (message);
if (bytes_written < 16)
{
/* TODO: I think this needs to be handled ... are we guaranteed that the ancillary
* messages are sent?
*/
g_assert_not_reached ();
}
}
#else
/* write the first 16 bytes (guaranteed to return an error if everything can't be written) */
if (!g_output_stream_write_all (g_io_stream_get_output_stream (worker->stream),
(const gchar *) data->blob,
16,
NULL, /* bytes_written */
worker->cancellable, /* cancellable */
error))
goto out;
#endif
/* Then write the rest of the message (guaranteed to return an error if everything can't be written) */
if (!g_output_stream_write_all (g_io_stream_get_output_stream (worker->stream),
(const gchar *) data->blob + 16,
data->blob_size - 16,
NULL, /* bytes_written */
worker->cancellable, /* cancellable */
error))
goto out;
ret = TRUE;
if (G_UNLIKELY (_g_dbus_debug_message ()))
{
gchar *s;
g_print ("========================================================================\n"
"GDBus-debug:Message:\n"
" >>>> SENT D-Bus message (%" G_GSIZE_FORMAT " bytes)\n",
data->blob_size);
s = g_dbus_message_print (data->message, 2);
g_print ("%s", s);
g_free (s);
s = _g_dbus_hexdump (data->blob, data->blob_size, 2);
g_print ("%s\n", s);
g_free (s);
}
out:
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/* called in private thread shared by all GDBusConnection instances (without write-lock held) */
static gboolean
write_message_in_idle_cb (gpointer user_data)
{
GDBusWorker *worker = user_data;
gboolean more_writes_are_pending;
MessageToWriteData *data;
GError *error;
g_mutex_lock (worker->write_lock);
data = g_queue_pop_head (worker->write_queue);
g_assert (data != NULL);
error = NULL;
if (!write_message (worker,
data,
&error))
{
/* TODO: handle */
_g_dbus_worker_emit_disconnected (worker, TRUE, error);
g_error_free (error);
}
message_to_write_data_free (data);
more_writes_are_pending = (g_queue_get_length (worker->write_queue) > 0);
worker->write_is_pending = more_writes_are_pending;
g_mutex_unlock (worker->write_lock);
return more_writes_are_pending;
}
/* ---------------------------------------------------------------------------------------------------- */
/* can be called from any thread - steals blob */
void
_g_dbus_worker_send_message (GDBusWorker *worker,
GDBusMessage *message,
gchar *blob,
gsize blob_len)
{
MessageToWriteData *data;
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (blob != NULL);
g_return_if_fail (blob_len > 16);
data = g_new0 (MessageToWriteData, 1);
data->message = g_object_ref (message);
data->blob = blob; /* steal! */
data->blob_size = blob_len;
g_mutex_lock (worker->write_lock);
g_queue_push_tail (worker->write_queue, data);
if (!worker->write_is_pending)
{
GSource *idle_source;
worker->write_is_pending = TRUE;
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
write_message_in_idle_cb,
_g_dbus_worker_ref (worker),
(GDestroyNotify) _g_dbus_worker_unref);
g_source_attach (idle_source, shared_thread_data->context);
g_source_unref (idle_source);
}
g_mutex_unlock (worker->write_lock);
}
/* ---------------------------------------------------------------------------------------------------- */
static void
_g_dbus_worker_thread_begin_func (gpointer user_data)
{
GDBusWorker *worker = user_data;
worker->thread = g_thread_self ();
/* begin reading */
_g_dbus_worker_do_read (worker);
}
GDBusWorker *
_g_dbus_worker_new (GIOStream *stream,
GDBusCapabilityFlags capabilities,
GDBusWorkerMessageReceivedCallback message_received_callback,
GDBusWorkerDisconnectedCallback disconnected_callback,
gpointer user_data)
{
GDBusWorker *worker;
g_return_val_if_fail (G_IS_IO_STREAM (stream), NULL);
g_return_val_if_fail (message_received_callback != NULL, NULL);
g_return_val_if_fail (disconnected_callback != NULL, NULL);
worker = g_new0 (GDBusWorker, 1);
worker->ref_count = 1;
worker->read_lock = g_mutex_new ();
worker->message_received_callback = message_received_callback;
worker->disconnected_callback = disconnected_callback;
worker->user_data = user_data;
worker->stream = g_object_ref (stream);
worker->capabilities = capabilities;
worker->cancellable = g_cancellable_new ();
worker->write_lock = g_mutex_new ();
worker->write_queue = g_queue_new ();
if (G_IS_SOCKET_CONNECTION (worker->stream))
worker->socket = g_socket_connection_get_socket (G_SOCKET_CONNECTION (worker->stream));
_g_dbus_shared_thread_ref (_g_dbus_worker_thread_begin_func, worker);
return worker;
}
/* This can be called from any thread - frees worker - guarantees no callbacks
* will ever be issued again
*/
void
_g_dbus_worker_stop (GDBusWorker *worker)
{
/* If we're called in the worker thread it means we are called from
* a worker callback. This is fine, we just can't lock in that case since
* we're already holding the lock...
*/
if (g_thread_self () != worker->thread)
g_mutex_lock (worker->read_lock);
worker->stopped = TRUE;
if (g_thread_self () != worker->thread)
g_mutex_unlock (worker->read_lock);
g_cancellable_cancel (worker->cancellable);
_g_dbus_worker_unref (worker);
}
#define G_DBUS_DEBUG_AUTHENTICATION (1<<0)
#define G_DBUS_DEBUG_MESSAGE (1<<1)
#define G_DBUS_DEBUG_ALL 0xffffffff
static gint _gdbus_debug_flags = 0;
gboolean
_g_dbus_debug_authentication (void)
{
_g_dbus_initialize ();
return (_gdbus_debug_flags & G_DBUS_DEBUG_AUTHENTICATION) != 0;
}
gboolean
_g_dbus_debug_message (void)
{
_g_dbus_initialize ();
return (_gdbus_debug_flags & G_DBUS_DEBUG_MESSAGE) != 0;
}
/*
* _g_dbus_initialize:
*
* Does various one-time init things such as
*
* - registering the G_DBUS_ERROR error domain
* - parses the G_DBUS_DEBUG environment variable
*/
void
_g_dbus_initialize (void)
{
static volatile gsize initialized = 0;
if (g_once_init_enter (&initialized))
{
volatile GQuark g_dbus_error_domain;
const gchar *debug;
g_dbus_error_domain = G_DBUS_ERROR;
debug = g_getenv ("G_DBUS_DEBUG");
if (debug != NULL)
{
gchar **tokens;
guint n;
tokens = g_strsplit (debug, ",", 0);
for (n = 0; tokens[n] != NULL; n++)
{
if (g_strcmp0 (tokens[n], "authentication") == 0)
_gdbus_debug_flags |= G_DBUS_DEBUG_AUTHENTICATION;
else if (g_strcmp0 (tokens[n], "message") == 0)
_gdbus_debug_flags |= G_DBUS_DEBUG_MESSAGE;
else if (g_strcmp0 (tokens[n], "all") == 0)
_gdbus_debug_flags |= G_DBUS_DEBUG_ALL;
}
g_strfreev (tokens);
}
g_once_init_leave (&initialized, 1);
}
}
/* ---------------------------------------------------------------------------------------------------- */
GVariantType *
_g_dbus_compute_complete_signature (GDBusArgInfo **args)
{
const GVariantType *arg_types[256];
guint n;
if (args)
for (n = 0; args[n] != NULL; n++)
{
/* DBus places a hard limit of 255 on signature length.
* therefore number of args must be less than 256.
*/
g_assert (n < 256);
arg_types[n] = G_VARIANT_TYPE (args[n]->signature);
if G_UNLIKELY (arg_types[n] == NULL)
return NULL;
}
else
n = 0;
return g_variant_type_new_tuple (arg_types, n);
}
/* ---------------------------------------------------------------------------------------------------- */
#ifdef G_OS_WIN32
extern BOOL WINAPI ConvertSidToStringSidA (PSID Sid, LPSTR *StringSid);
gchar *
_g_dbus_win32_get_user_sid (void)
{
HANDLE h;
TOKEN_USER *user;
DWORD token_information_len;
PSID psid;
gchar *sid;
gchar *ret;
ret = NULL;
user = NULL;
h = INVALID_HANDLE_VALUE;
if (!OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &h))
{
g_warning ("OpenProcessToken failed with error code %d", (gint) GetLastError ());
goto out;
}
/* Get length of buffer */
token_information_len = 0;
if (!GetTokenInformation (h, TokenUser, NULL, 0, &token_information_len))
{
if (GetLastError () != ERROR_INSUFFICIENT_BUFFER)
{
g_warning ("GetTokenInformation() failed with error code %d", (gint) GetLastError ());
goto out;
}
}
user = g_malloc (token_information_len);
if (!GetTokenInformation (h, TokenUser, user, token_information_len, &token_information_len))
{
g_warning ("GetTokenInformation() failed with error code %d", (gint) GetLastError ());
goto out;
}
psid = user->User.Sid;
if (!IsValidSid (psid))
{
g_warning ("Invalid SID");
goto out;
}
if (!ConvertSidToStringSidA (psid, &sid))
{
g_warning ("Invalid SID");
goto out;
}
ret = g_strdup (sid);
LocalFree (sid);
out:
g_free (user);
if (h != INVALID_HANDLE_VALUE)
CloseHandle (h);
return ret;
}
#endif
/* ---------------------------------------------------------------------------------------------------- */
#define __G_DBUS_PRIVATE_C__
#include "gioaliasdef.c"
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