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glib/gio/gdbusserver.c
Philip Withnall caf6d99fbe Merge branch 'win32-fd' into 'main' 
gio: various unix/fd-related enablement on win32

See merge request GNOME/glib!2656
2022-05-18 14:01:43 +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>
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "giotypes.h"
#include "gioerror.h"
#include "gdbusaddress.h"
#include "gdbusutils.h"
#include "gdbusconnection.h"
#include "gdbusserver.h"
#include "gioenumtypes.h"
#include "gdbusprivate.h"
#include "gdbusauthobserver.h"
#include "ginitable.h"
#include "gsocketservice.h"
#include "gthreadedsocketservice.h"
#include "gresolver.h"
#include "glib/gstdio.h"
#include "ginetaddress.h"
#include "ginetsocketaddress.h"
#include "ginputstream.h"
#include "giostream.h"
#include "gmarshal-internal.h"
#ifdef G_OS_UNIX
#include <unistd.h>
#endif
#ifdef G_OS_WIN32
#include <io.h>
#endif
#include "gunixsocketaddress.h"
#include "glibintl.h"
#define G_DBUS_SERVER_FLAGS_ALL \
(G_DBUS_SERVER_FLAGS_RUN_IN_THREAD | \
G_DBUS_SERVER_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS | \
G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER)
/**
* SECTION:gdbusserver
* @short_description: Helper for accepting connections
* @include: gio/gio.h
*
* #GDBusServer is a helper for listening to and accepting D-Bus
* connections. This can be used to create a new D-Bus server, allowing two
* peers to use the D-Bus protocol for their own specialized communication.
* A server instance provided in this way will not perform message routing or
* implement the org.freedesktop.DBus interface.
*
* To just export an object on a well-known name on a message bus, such as the
* session or system bus, you should instead use g_bus_own_name().
*
* An example of peer-to-peer communication with GDBus can be found
* in [gdbus-example-peer.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-peer.c).
*
* Note that a minimal #GDBusServer will accept connections from any
* peer. In many use-cases it will be necessary to add a #GDBusAuthObserver
* that only accepts connections that have successfully authenticated
* as the same user that is running the #GDBusServer. Since GLib 2.68 this can
* be achieved more simply by passing the
* %G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER flag to the server.
*/
/**
* GDBusServer:
*
* The #GDBusServer structure contains only private data and
* should only be accessed using the provided API.
*
* Since: 2.26
*/
struct _GDBusServer
{
/*< private >*/
GObject parent_instance;
GDBusServerFlags flags;
gchar *address;
gchar *guid;
guchar *nonce;
gchar *nonce_file;
gchar *client_address;
gchar *unix_socket_path;
GSocketListener *listener;
gboolean is_using_listener;
gulong run_signal_handler_id;
/* The result of g_main_context_ref_thread_default() when the object
* was created (the GObject _init() function) - this is used for delivery
* of the :new-connection GObject signal.
*/
GMainContext *main_context_at_construction;
gboolean active;
GDBusAuthObserver *authentication_observer;
};
typedef struct _GDBusServerClass GDBusServerClass;
/**
* GDBusServerClass:
* @new_connection: Signal class handler for the #GDBusServer::new-connection signal.
*
* Class structure for #GDBusServer.
*
* Since: 2.26
*/
struct _GDBusServerClass
{
/*< private >*/
GObjectClass parent_class;
/*< public >*/
/* Signals */
gboolean (*new_connection) (GDBusServer *server,
GDBusConnection *connection);
};
enum
{
PROP_0,
PROP_ADDRESS,
PROP_CLIENT_ADDRESS,
PROP_FLAGS,
PROP_GUID,
PROP_ACTIVE,
PROP_AUTHENTICATION_OBSERVER,
};
enum
{
NEW_CONNECTION_SIGNAL,
LAST_SIGNAL,
};
static guint _signals[LAST_SIGNAL] = {0};
static void initable_iface_init (GInitableIface *initable_iface);
G_DEFINE_TYPE_WITH_CODE (GDBusServer, g_dbus_server, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init))
static void
g_dbus_server_dispose (GObject *object)
{
GDBusServer *server = G_DBUS_SERVER (object);
if (server->active)
g_dbus_server_stop (server);
G_OBJECT_CLASS (g_dbus_server_parent_class)->dispose (object);
}
static void
g_dbus_server_finalize (GObject *object)
{
GDBusServer *server = G_DBUS_SERVER (object);
g_assert (!server->active);
if (server->authentication_observer != NULL)
g_object_unref (server->authentication_observer);
if (server->run_signal_handler_id > 0)
g_signal_handler_disconnect (server->listener, server->run_signal_handler_id);
if (server->listener != NULL)
g_object_unref (server->listener);
g_free (server->address);
g_free (server->guid);
g_free (server->client_address);
if (server->nonce != NULL)
{
memset (server->nonce, '\0', 16);
g_free (server->nonce);
}
g_free (server->unix_socket_path);
g_free (server->nonce_file);
g_main_context_unref (server->main_context_at_construction);
G_OBJECT_CLASS (g_dbus_server_parent_class)->finalize (object);
}
static void
g_dbus_server_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GDBusServer *server = G_DBUS_SERVER (object);
switch (prop_id)
{
case PROP_FLAGS:
g_value_set_flags (value, server->flags);
break;
case PROP_GUID:
g_value_set_string (value, server->guid);
break;
case PROP_ADDRESS:
g_value_set_string (value, server->address);
break;
case PROP_CLIENT_ADDRESS:
g_value_set_string (value, server->client_address);
break;
case PROP_ACTIVE:
g_value_set_boolean (value, server->active);
break;
case PROP_AUTHENTICATION_OBSERVER:
g_value_set_object (value, server->authentication_observer);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_dbus_server_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GDBusServer *server = G_DBUS_SERVER (object);
switch (prop_id)
{
case PROP_FLAGS:
server->flags = g_value_get_flags (value);
break;
case PROP_GUID:
server->guid = g_value_dup_string (value);
break;
case PROP_ADDRESS:
server->address = g_value_dup_string (value);
break;
case PROP_AUTHENTICATION_OBSERVER:
server->authentication_observer = g_value_dup_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_dbus_server_class_init (GDBusServerClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->dispose = g_dbus_server_dispose;
gobject_class->finalize = g_dbus_server_finalize;
gobject_class->set_property = g_dbus_server_set_property;
gobject_class->get_property = g_dbus_server_get_property;
/**
* GDBusServer:flags:
*
* Flags from the #GDBusServerFlags enumeration.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_FLAGS,
g_param_spec_flags ("flags",
P_("Flags"),
P_("Flags for the server"),
G_TYPE_DBUS_SERVER_FLAGS,
G_DBUS_SERVER_FLAGS_NONE,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusServer:guid:
*
* The GUID of the server.
*
* See #GDBusConnection:guid for more details.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_GUID,
g_param_spec_string ("guid",
P_("GUID"),
P_("The guid of the server"),
NULL,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusServer:address:
*
* The D-Bus address to listen on.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_ADDRESS,
g_param_spec_string ("address",
P_("Address"),
P_("The address to listen on"),
NULL,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusServer:client-address:
*
* The D-Bus address that clients can use.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_CLIENT_ADDRESS,
g_param_spec_string ("client-address",
P_("Client Address"),
P_("The address clients can use"),
NULL,
G_PARAM_READABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusServer:active:
*
* Whether the server is currently active.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_ACTIVE,
g_param_spec_boolean ("active",
P_("Active"),
P_("Whether the server is currently active"),
FALSE,
G_PARAM_READABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusServer:authentication-observer:
*
* A #GDBusAuthObserver object to assist in the authentication process or %NULL.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_AUTHENTICATION_OBSERVER,
g_param_spec_object ("authentication-observer",
P_("Authentication Observer"),
P_("Object used to assist in the authentication process"),
G_TYPE_DBUS_AUTH_OBSERVER,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusServer::new-connection:
* @server: The #GDBusServer emitting the signal.
* @connection: A #GDBusConnection for the new connection.
*
* Emitted when a new authenticated connection has been made. Use
* g_dbus_connection_get_peer_credentials() to figure out what
* identity (if any), was authenticated.
*
* If you want to accept the connection, take a reference to the
* @connection object and return %TRUE. When you are done with the
* connection call g_dbus_connection_close() and give up your
* reference. Note that the other peer may disconnect at any time -
* a typical thing to do when accepting a connection is to listen to
* the #GDBusConnection::closed signal.
*
* If #GDBusServer:flags contains %G_DBUS_SERVER_FLAGS_RUN_IN_THREAD
* then the signal is emitted in a new thread dedicated to the
* connection. Otherwise the signal is emitted in the
* [thread-default main context][g-main-context-push-thread-default]
* of the thread that @server was constructed in.
*
* You are guaranteed that signal handlers for this signal runs
* before incoming messages on @connection are processed. This means
* that it's suitable to call g_dbus_connection_register_object() or
* similar from the signal handler.
*
* Returns: %TRUE to claim @connection, %FALSE to let other handlers
* run.
*
* Since: 2.26
*/
_signals[NEW_CONNECTION_SIGNAL] = g_signal_new (I_("new-connection"),
G_TYPE_DBUS_SERVER,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GDBusServerClass, new_connection),
g_signal_accumulator_true_handled,
NULL, /* accu_data */
_g_cclosure_marshal_BOOLEAN__OBJECT,
G_TYPE_BOOLEAN,
1,
G_TYPE_DBUS_CONNECTION);
g_signal_set_va_marshaller (_signals[NEW_CONNECTION_SIGNAL],
G_TYPE_FROM_CLASS (klass),
_g_cclosure_marshal_BOOLEAN__OBJECTv);
}
static void
g_dbus_server_init (GDBusServer *server)
{
server->main_context_at_construction = g_main_context_ref_thread_default ();
}
static gboolean
on_run (GSocketService *service,
GSocketConnection *socket_connection,
GObject *source_object,
gpointer user_data);
/**
* g_dbus_server_new_sync:
* @address: A D-Bus address.
* @flags: Flags from the #GDBusServerFlags enumeration.
* @guid: A D-Bus GUID.
* @observer: (nullable): A #GDBusAuthObserver or %NULL.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @error: Return location for server or %NULL.
*
* Creates a new D-Bus server that listens on the first address in
* @address that works.
*
* Once constructed, you can use g_dbus_server_get_client_address() to
* get a D-Bus address string that clients can use to connect.
*
* To have control over the available authentication mechanisms and
* the users that are authorized to connect, it is strongly recommended
* to provide a non-%NULL #GDBusAuthObserver.
*
* Connect to the #GDBusServer::new-connection signal to handle
* incoming connections.
*
* The returned #GDBusServer isn't active - you have to start it with
* g_dbus_server_start().
*
* #GDBusServer is used in this [example][gdbus-peer-to-peer].
*
* This is a synchronous failable constructor. There is currently no
* asynchronous version.
*
* Returns: A #GDBusServer or %NULL if @error is set. Free with
* g_object_unref().
*
* Since: 2.26
*/
GDBusServer *
g_dbus_server_new_sync (const gchar *address,
GDBusServerFlags flags,
const gchar *guid,
GDBusAuthObserver *observer,
GCancellable *cancellable,
GError **error)
{
GDBusServer *server;
g_return_val_if_fail (address != NULL, NULL);
g_return_val_if_fail (g_dbus_is_guid (guid), NULL);
g_return_val_if_fail ((flags & ~G_DBUS_SERVER_FLAGS_ALL) == 0, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
server = g_initable_new (G_TYPE_DBUS_SERVER,
cancellable,
error,
"address", address,
"flags", flags,
"guid", guid,
"authentication-observer", observer,
NULL);
return server;
}
/**
* g_dbus_server_get_client_address:
* @server: A #GDBusServer.
*
* Gets a
* [D-Bus address](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses)
* string that can be used by clients to connect to @server.
*
* This is valid and non-empty if initializing the #GDBusServer succeeded.
*
* Returns: (not nullable): A D-Bus address string. Do not free, the string is owned
* by @server.
*
* Since: 2.26
*/
const gchar *
g_dbus_server_get_client_address (GDBusServer *server)
{
g_return_val_if_fail (G_IS_DBUS_SERVER (server), NULL);
return server->client_address;
}
/**
* g_dbus_server_get_guid:
* @server: A #GDBusServer.
*
* Gets the GUID for @server, as provided to g_dbus_server_new_sync().
*
* Returns: (not nullable): A D-Bus GUID. Do not free this string, it is owned by @server.
*
* Since: 2.26
*/
const gchar *
g_dbus_server_get_guid (GDBusServer *server)
{
g_return_val_if_fail (G_IS_DBUS_SERVER (server), NULL);
return server->guid;
}
/**
* g_dbus_server_get_flags:
* @server: A #GDBusServer.
*
* Gets the flags for @server.
*
* Returns: A set of flags from the #GDBusServerFlags enumeration.
*
* Since: 2.26
*/
GDBusServerFlags
g_dbus_server_get_flags (GDBusServer *server)
{
g_return_val_if_fail (G_IS_DBUS_SERVER (server), G_DBUS_SERVER_FLAGS_NONE);
return server->flags;
}
/**
* g_dbus_server_is_active:
* @server: A #GDBusServer.
*
* Gets whether @server is active.
*
* Returns: %TRUE if server is active, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_server_is_active (GDBusServer *server)
{
g_return_val_if_fail (G_IS_DBUS_SERVER (server), G_DBUS_SERVER_FLAGS_NONE);
return server->active;
}
/**
* g_dbus_server_start:
* @server: A #GDBusServer.
*
* Starts @server.
*
* Since: 2.26
*/
void
g_dbus_server_start (GDBusServer *server)
{
g_return_if_fail (G_IS_DBUS_SERVER (server));
if (server->active)
return;
/* Right now we don't have any transport not using the listener... */
g_assert (server->is_using_listener);
server->run_signal_handler_id = g_signal_connect_data (G_SOCKET_SERVICE (server->listener),
"run",
G_CALLBACK (on_run),
g_object_ref (server),
(GClosureNotify) g_object_unref,
0 /* flags */);
g_socket_service_start (G_SOCKET_SERVICE (server->listener));
server->active = TRUE;
g_object_notify (G_OBJECT (server), "active");
}
/**
* g_dbus_server_stop:
* @server: A #GDBusServer.
*
* Stops @server.
*
* Since: 2.26
*/
void
g_dbus_server_stop (GDBusServer *server)
{
g_return_if_fail (G_IS_DBUS_SERVER (server));
if (!server->active)
return;
/* Right now we don't have any transport not using the listener... */
g_assert (server->is_using_listener);
g_assert (server->run_signal_handler_id > 0);
g_clear_signal_handler (&server->run_signal_handler_id, server->listener);
g_socket_service_stop (G_SOCKET_SERVICE (server->listener));
server->active = FALSE;
g_object_notify (G_OBJECT (server), "active");
if (server->unix_socket_path)
{
if (g_unlink (server->unix_socket_path) != 0)
g_warning ("Failed to delete %s: %s", server->unix_socket_path, g_strerror (errno));
}
if (server->nonce_file)
{
if (g_unlink (server->nonce_file) != 0)
g_warning ("Failed to delete %s: %s", server->nonce_file, g_strerror (errno));
}
}
/* ---------------------------------------------------------------------------------------------------- */
static gint
random_ascii (void)
{
gint ret;
ret = g_random_int_range (0, 60);
if (ret < 25)
ret += 'A';
else if (ret < 50)
ret += 'a' - 25;
else
ret += '0' - 50;
return ret;
}
/* note that address_entry has already been validated => exactly one of path, dir, tmpdir, or abstract keys are set */
static gboolean
try_unix (GDBusServer *server,
const gchar *address_entry,
GHashTable *key_value_pairs,
GError **error)
{
gboolean ret;
const gchar *path;
const gchar *dir;
const gchar *tmpdir;
const gchar *abstract;
GSocketAddress *address;
ret = FALSE;
address = NULL;
path = g_hash_table_lookup (key_value_pairs, "path");
dir = g_hash_table_lookup (key_value_pairs, "dir");
tmpdir = g_hash_table_lookup (key_value_pairs, "tmpdir");
abstract = g_hash_table_lookup (key_value_pairs, "abstract");
if (path != NULL)
{
address = g_unix_socket_address_new (path);
}
else if (dir != NULL || tmpdir != NULL)
{
gint n;
GString *s;
GError *local_error;
retry:
s = g_string_new (tmpdir != NULL ? tmpdir : dir);
g_string_append (s, "/dbus-");
for (n = 0; n < 8; n++)
g_string_append_c (s, random_ascii ());
/* prefer abstract namespace if available for tmpdir: addresses
* abstract namespace is disallowed for dir: addresses */
if (tmpdir != NULL && g_unix_socket_address_abstract_names_supported ())
address = g_unix_socket_address_new_with_type (s->str,
-1,
G_UNIX_SOCKET_ADDRESS_ABSTRACT);
else
address = g_unix_socket_address_new (s->str);
g_string_free (s, TRUE);
local_error = NULL;
if (!g_socket_listener_add_address (server->listener,
address,
G_SOCKET_TYPE_STREAM,
G_SOCKET_PROTOCOL_DEFAULT,
NULL, /* source_object */
NULL, /* effective_address */
&local_error))
{
if (local_error->domain == G_IO_ERROR && local_error->code == G_IO_ERROR_ADDRESS_IN_USE)
{
g_error_free (local_error);
goto retry;
}
g_propagate_error (error, local_error);
goto out;
}
ret = TRUE;
goto out;
}
else if (abstract != NULL)
{
if (!g_unix_socket_address_abstract_names_supported ())
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Abstract namespace not supported"));
goto out;
}
address = g_unix_socket_address_new_with_type (abstract,
-1,
G_UNIX_SOCKET_ADDRESS_ABSTRACT);
}
else
{
g_assert_not_reached ();
}
if (!g_socket_listener_add_address (server->listener,
address,
G_SOCKET_TYPE_STREAM,
G_SOCKET_PROTOCOL_DEFAULT,
NULL, /* source_object */
NULL, /* effective_address */
error))
goto out;
ret = TRUE;
out:
if (address != NULL)
{
/* Fill out client_address if the connection attempt worked */
if (ret)
{
const char *address_path;
char *escaped_path;
server->is_using_listener = TRUE;
address_path = g_unix_socket_address_get_path (G_UNIX_SOCKET_ADDRESS (address));
escaped_path = g_dbus_address_escape_value (address_path);
switch (g_unix_socket_address_get_address_type (G_UNIX_SOCKET_ADDRESS (address)))
{
case G_UNIX_SOCKET_ADDRESS_ABSTRACT:
server->client_address = g_strdup_printf ("unix:abstract=%s", escaped_path);
break;
case G_UNIX_SOCKET_ADDRESS_PATH:
server->client_address = g_strdup_printf ("unix:path=%s", escaped_path);
server->unix_socket_path = g_strdup (address_path);
break;
default:
g_assert_not_reached ();
break;
}
g_free (escaped_path);
}
g_object_unref (address);
}
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/* note that address_entry has already been validated =>
* both host and port (guaranteed to be a number in [0, 65535]) are set (family is optional)
*/
static gboolean
try_tcp (GDBusServer *server,
const gchar *address_entry,
GHashTable *key_value_pairs,
gboolean do_nonce,
GError **error)
{
gboolean ret;
const gchar *host;
const gchar *port;
gint port_num;
GResolver *resolver;
GList *resolved_addresses;
GList *l;
ret = FALSE;
resolver = NULL;
resolved_addresses = NULL;
host = g_hash_table_lookup (key_value_pairs, "host");
port = g_hash_table_lookup (key_value_pairs, "port");
/* family = g_hash_table_lookup (key_value_pairs, "family"); */
if (g_hash_table_lookup (key_value_pairs, "noncefile") != NULL)
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Cannot specify nonce file when creating a server"));
goto out;
}
if (host == NULL)
host = "localhost";
if (port == NULL)
port = "0";
port_num = strtol (port, NULL, 10);
resolver = g_resolver_get_default ();
resolved_addresses = g_resolver_lookup_by_name (resolver,
host,
NULL,
error);
if (resolved_addresses == NULL)
goto out;
/* TODO: handle family */
for (l = resolved_addresses; l != NULL; l = l->next)
{
GInetAddress *address = G_INET_ADDRESS (l->data);
GSocketAddress *socket_address;
GSocketAddress *effective_address;
socket_address = g_inet_socket_address_new (address, port_num);
if (!g_socket_listener_add_address (server->listener,
socket_address,
G_SOCKET_TYPE_STREAM,
G_SOCKET_PROTOCOL_TCP,
NULL, /* GObject *source_object */
&effective_address,
error))
{
g_object_unref (socket_address);
goto out;
}
if (port_num == 0)
/* make sure we allocate the same port number for other listeners */
port_num = g_inet_socket_address_get_port (G_INET_SOCKET_ADDRESS (effective_address));
g_object_unref (effective_address);
g_object_unref (socket_address);
}
if (do_nonce)
{
gint fd;
guint n;
gsize bytes_written;
gsize bytes_remaining;
char *file_escaped;
char *host_escaped;
server->nonce = g_new0 (guchar, 16);
for (n = 0; n < 16; n++)
server->nonce[n] = g_random_int_range (0, 256);
fd = g_file_open_tmp ("gdbus-nonce-file-XXXXXX",
&server->nonce_file,
error);
if (fd == -1)
{
g_socket_listener_close (server->listener);
goto out;
}
again:
bytes_written = 0;
bytes_remaining = 16;
while (bytes_remaining > 0)
{
gssize size;
int errsv;
size = write (fd, server->nonce + bytes_written, bytes_remaining);
errsv = errno;
if (size == -1)
{
if (errsv == EINTR)
goto again;
g_set_error (error,
G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error writing nonce file at “%s”: %s"),
server->nonce_file,
g_strerror (errsv));
goto out;
}
bytes_written += size;
bytes_remaining -= size;
}
if (!g_close (fd, error))
goto out;
host_escaped = g_dbus_address_escape_value (host);
file_escaped = g_dbus_address_escape_value (server->nonce_file);
server->client_address = g_strdup_printf ("nonce-tcp:host=%s,port=%d,noncefile=%s",
host_escaped,
port_num,
file_escaped);
g_free (host_escaped);
g_free (file_escaped);
}
else
{
server->client_address = g_strdup_printf ("tcp:host=%s,port=%d", host, port_num);
}
server->is_using_listener = TRUE;
ret = TRUE;
out:
g_list_free_full (resolved_addresses, g_object_unref);
if (resolver)
g_object_unref (resolver);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GDBusServer *server;
GDBusConnection *connection;
} EmitIdleData;
static void
emit_idle_data_free (EmitIdleData *data)
{
g_object_unref (data->server);
g_object_unref (data->connection);
g_free (data);
}
static gboolean
emit_new_connection_in_idle (gpointer user_data)
{
EmitIdleData *data = user_data;
gboolean claimed;
claimed = FALSE;
g_signal_emit (data->server,
_signals[NEW_CONNECTION_SIGNAL],
0,
data->connection,
&claimed);
if (claimed)
g_dbus_connection_start_message_processing (data->connection);
g_object_unref (data->connection);
return FALSE;
}
/* Called in new thread */
static gboolean
on_run (GSocketService *service,
GSocketConnection *socket_connection,
GObject *source_object,
gpointer user_data)
{
GDBusServer *server = G_DBUS_SERVER (user_data);
GDBusConnection *connection;
GDBusConnectionFlags connection_flags;
if (server->nonce != NULL)
{
gchar buf[16];
gsize bytes_read;
if (!g_input_stream_read_all (g_io_stream_get_input_stream (G_IO_STREAM (socket_connection)),
buf,
16,
&bytes_read,
NULL, /* GCancellable */
NULL)) /* GError */
goto out;
if (bytes_read != 16)
goto out;
if (memcmp (buf, server->nonce, 16) != 0)
goto out;
}
connection_flags =
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER |
G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING;
if (server->flags & G_DBUS_SERVER_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS)
connection_flags |= G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS;
if (server->flags & G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER)
connection_flags |= G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER;
connection = g_dbus_connection_new_sync (G_IO_STREAM (socket_connection),
server->guid,
connection_flags,
server->authentication_observer,
NULL, /* GCancellable */
NULL); /* GError */
if (connection == NULL)
goto out;
if (server->flags & G_DBUS_SERVER_FLAGS_RUN_IN_THREAD)
{
gboolean claimed;
claimed = FALSE;
g_signal_emit (server,
_signals[NEW_CONNECTION_SIGNAL],
0,
connection,
&claimed);
if (claimed)
g_dbus_connection_start_message_processing (connection);
g_object_unref (connection);
}
else
{
GSource *idle_source;
EmitIdleData *data;
data = g_new0 (EmitIdleData, 1);
data->server = g_object_ref (server);
data->connection = g_object_ref (connection);
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
emit_new_connection_in_idle,
data,
(GDestroyNotify) emit_idle_data_free);
g_source_set_static_name (idle_source, "[gio] emit_new_connection_in_idle");
g_source_attach (idle_source, server->main_context_at_construction);
g_source_unref (idle_source);
}
out:
return TRUE;
}
static gboolean
initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
GDBusServer *server = G_DBUS_SERVER (initable);
gboolean ret;
guint n;
gchar **addr_array;
GError *last_error;
ret = FALSE;
addr_array = NULL;
last_error = NULL;
if (!g_dbus_is_guid (server->guid))
{
g_set_error (&last_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("The string “%s” is not a valid D-Bus GUID"),
server->guid);
goto out;
}
server->listener = G_SOCKET_LISTENER (g_threaded_socket_service_new (-1));
addr_array = g_strsplit (server->address, ";", 0);
last_error = NULL;
for (n = 0; addr_array != NULL && addr_array[n] != NULL; n++)
{
const gchar *address_entry = addr_array[n];
GHashTable *key_value_pairs;
gchar *transport_name;
GError *this_error;
this_error = NULL;
if (g_dbus_is_supported_address (address_entry,
&this_error) &&
_g_dbus_address_parse_entry (address_entry,
&transport_name,
&key_value_pairs,
&this_error))
{
if (FALSE)
{
}
else if (g_strcmp0 (transport_name, "unix") == 0)
ret = try_unix (server, address_entry, key_value_pairs, &this_error);
else if (g_strcmp0 (transport_name, "tcp") == 0)
ret = try_tcp (server, address_entry, key_value_pairs, FALSE, &this_error);
else if (g_strcmp0 (transport_name, "nonce-tcp") == 0)
ret = try_tcp (server, address_entry, key_value_pairs, TRUE, &this_error);
else
g_set_error (&this_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Cannot listen on unsupported transport “%s”"),
transport_name);
g_free (transport_name);
if (key_value_pairs != NULL)
g_hash_table_unref (key_value_pairs);
if (ret)
{
g_assert (this_error == NULL);
goto out;
}
}
if (this_error != NULL)
{
if (last_error != NULL)
g_error_free (last_error);
last_error = this_error;
}
}
out:
g_strfreev (addr_array);
if (ret)
{
g_clear_error (&last_error);
}
else
{
g_assert (last_error != NULL);
g_propagate_error (error, last_error);
}
return ret;
}
static void
initable_iface_init (GInitableIface *initable_iface)
{
initable_iface->init = initable_init;
}
/* ---------------------------------------------------------------------------------------------------- */
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