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xserver/config/dbus.c

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/*
* Copyright © 2006-2007 Daniel Stone
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Author: Daniel Stone <daniel@fooishbar.org>
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#define DBUS_API_SUBJECT_TO_CHANGE
#include <dbus/dbus.h>
#include <string.h>
#include <X11/X.h>
#include "config-backends.h"
#include "opaque.h" /* for 'display': there should be a better way. */
#include "input.h"
#include "inputstr.h"
#define API_VERSION 2
#define MATCH_RULE "type='method_call',interface='org.x.config.input'"
#define MALFORMED_MSG "[config/dbus] malformed message, dropping"
#define MALFORMED_MESSAGE() { DebugF(MALFORMED_MSG "\n"); \
ret = BadValue; \
goto unwind; }
#define MALFORMED_MESSAGE_ERROR() { DebugF(MALFORMED_MSG ": %s, %s", \
error->name, error->message); \
ret = BadValue; \
goto unwind; }
struct connection_info {
char busobject[32];
char busname[64];
DBusConnection *connection;
};
static void
reset_info(struct connection_info *info)
{
info->connection = NULL;
info->busname[0] = '\0';
info->busobject[0] = '\0';
}
static int
add_device(DBusMessage *message, DBusMessage *reply, DBusError *error)
{
DBusMessageIter iter, reply_iter, subiter;
InputOption *tmpo = NULL, *options = NULL;
char *tmp = NULL;
int ret, err;
DeviceIntPtr dev = NULL;
dbus_message_iter_init_append(reply, &reply_iter);
if (!dbus_message_iter_init(message, &iter)) {
ErrorF("[config/dbus] couldn't initialise iterator\n");
MALFORMED_MESSAGE();
}
options = xcalloc(sizeof(*options), 1);
if (!options) {
ErrorF("[config/dbus] couldn't allocate option\n");
return BadAlloc;
}
options->key = xstrdup("_source");
options->value = xstrdup("client/dbus");
if (!options->key || !options->value) {
ErrorF("[config/dbus] couldn't allocate first key/value pair\n");
ret = BadAlloc;
goto unwind;
}
/* signature should be [ss][ss]... */
while (dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_ARRAY) {
tmpo = xcalloc(sizeof(*tmpo), 1);
if (!tmpo) {
ErrorF("[config/dbus] couldn't allocate option\n");
ret = BadAlloc;
goto unwind;
}
tmpo->next = options;
options = tmpo;
dbus_message_iter_recurse(&iter, &subiter);
if (dbus_message_iter_get_arg_type(&subiter) != DBUS_TYPE_STRING)
MALFORMED_MESSAGE();
dbus_message_iter_get_basic(&subiter, &tmp);
if (!tmp)
MALFORMED_MESSAGE();
/* The _ prefix refers to internal settings, and may not be given by
* the client. */
if (tmp[0] == '_') {
ErrorF("[config/dbus] attempted subterfuge: option name %s given\n",
tmp);
MALFORMED_MESSAGE();
}
options->key = xstrdup(tmp);
if (!options->key) {
ErrorF("[config/dbus] couldn't duplicate key!\n");
ret = BadAlloc;
goto unwind;
}
if (!dbus_message_iter_has_next(&subiter))
MALFORMED_MESSAGE();
dbus_message_iter_next(&subiter);
if (dbus_message_iter_get_arg_type(&subiter) != DBUS_TYPE_STRING)
MALFORMED_MESSAGE();
dbus_message_iter_get_basic(&subiter, &tmp);
if (!tmp)
MALFORMED_MESSAGE();
options->value = xstrdup(tmp);
if (!options->value) {
ErrorF("[config/dbus] couldn't duplicate option!\n");
ret = BadAlloc;
goto unwind;
}
dbus_message_iter_next(&iter);
}
ret = NewInputDeviceRequest(options, &dev);
if (ret != Success) {
DebugF("[config/dbus] NewInputDeviceRequest failed\n");
goto unwind;
}
if (!dev) {
DebugF("[config/dbus] NewInputDeviceRequest provided no device\n");
ret = BadImplementation;
goto unwind;
}
/* XXX: If we fail halfway through, we don't seem to have any way to
* empty the iterator, so you'll end up with some device IDs,
* plus an error. This seems to be a shortcoming in the D-Bus
* API. */
for (; dev; dev = dev->next) {
if (!dbus_message_iter_append_basic(&reply_iter, DBUS_TYPE_INT32,
&dev->id)) {
ErrorF("[config/dbus] couldn't append to iterator\n");
ret = BadAlloc;
goto unwind;
}
}
unwind:
if (ret != Success) {
if (dev)
RemoveDevice(dev, TRUE);
err = -ret;
dbus_message_iter_append_basic(&reply_iter, DBUS_TYPE_INT32, &err);
}
while (options) {
tmpo = options;
options = options->next;
if (tmpo->key)
xfree(tmpo->key);
if (tmpo->value)
xfree(tmpo->value);
xfree(tmpo);
}
return ret;
}
static int
remove_device(DBusMessage *message, DBusMessage *reply, DBusError *error)
{
int deviceid, ret, err;
DeviceIntPtr dev;
DBusMessageIter iter, reply_iter;
dbus_message_iter_init_append(reply, &reply_iter);
if (!dbus_message_iter_init(message, &iter)) {
ErrorF("[config/dbus] failed to init iterator\n");
MALFORMED_MESSAGE();
}
if (!dbus_message_get_args(message, error, DBUS_TYPE_UINT32,
&deviceid, DBUS_TYPE_INVALID)) {
MALFORMED_MESSAGE_ERROR();
}
dixLookupDevice(&dev, deviceid, serverClient, DixDestroyAccess);
if (!dev) {
DebugF("[config/dbus] bogus device id %d given\n", deviceid);
ret = BadMatch;
goto unwind;
}
DebugF("[config/dbus] removing device %s (id %d)\n", dev->name, deviceid);
/* Call PIE here so we don't try to dereference a device that's
* already been removed. */
OsBlockSignals();
ProcessInputEvents();
DeleteInputDeviceRequest(dev);
OsReleaseSignals();
ret = Success;
unwind:
err = (ret == Success) ? ret : -ret;
dbus_message_iter_append_basic(&reply_iter, DBUS_TYPE_INT32, &err);
return ret;
}
static int
list_devices(DBusMessage *message, DBusMessage *reply, DBusError *error)
{
DeviceIntPtr dev;
DBusMessageIter iter, subiter;
dbus_message_iter_init_append(reply, &iter);
for (dev = inputInfo.devices; dev; dev = dev->next) {
if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_STRUCT, NULL,
&subiter)) {
ErrorF("[config/dbus] couldn't init container\n");
return BadAlloc;
}
if (!dbus_message_iter_append_basic(&subiter, DBUS_TYPE_UINT32,
&dev->id)) {
ErrorF("[config/dbus] couldn't append to iterator\n");
return BadAlloc;
}
if (!dbus_message_iter_append_basic(&subiter, DBUS_TYPE_STRING,
&dev->name)) {
ErrorF("[config/dbus] couldn't append to iterator\n");
return BadAlloc;
}
if (!dbus_message_iter_close_container(&iter, &subiter)) {
ErrorF("[config/dbus] couldn't close container\n");
return BadAlloc;
}
}
return Success;
}
static int
get_version(DBusMessage *message, DBusMessage *reply, DBusError *error)
{
DBusMessageIter iter;
unsigned int version = API_VERSION;
dbus_message_iter_init_append(reply, &iter);
if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_UINT32, &version)) {
ErrorF("[config/dbus] couldn't append version\n");
return BadAlloc;
}
return Success;
}
static DBusHandlerResult
message_handler(DBusConnection *connection, DBusMessage *message, void *data)
{
DBusError error;
DBusMessage *reply;
struct connection_info *info = data;
/* ret is the overall D-Bus handler result, whereas err is the internal
* X error from our individual functions. */
int ret = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
int err;
DebugF("[config/dbus] received a message for %s\n",
dbus_message_get_interface(message));
dbus_error_init(&error);
reply = dbus_message_new_method_return(message);
if (!reply) {
ErrorF("[config/dbus] failed to create reply\n");
ret = DBUS_HANDLER_RESULT_NEED_MEMORY;
goto err_start;
}
if (strcmp(dbus_message_get_member(message), "add") == 0)
err = add_device(message, reply, &error);
else if (strcmp(dbus_message_get_member(message), "remove") == 0)
err = remove_device(message, reply, &error);
else if (strcmp(dbus_message_get_member(message), "listDevices") == 0)
err = list_devices(message, reply, &error);
else if (strcmp(dbus_message_get_member(message), "version") == 0)
err = get_version(message, reply, &error);
else
goto err_reply;
/* Failure to allocate is a special case. */
if (err == BadAlloc) {
ret = DBUS_HANDLER_RESULT_NEED_MEMORY;
goto err_reply;
}
/* While failure here is always an OOM, we don't return that,
* since that would result in devices being double-added/removed. */
if (dbus_connection_send(info->connection, reply, NULL))
dbus_connection_flush(info->connection);
else
ErrorF("[config/dbus] failed to send reply\n");
ret = DBUS_HANDLER_RESULT_HANDLED;
err_reply:
dbus_message_unref(reply);
err_start:
dbus_error_free(&error);
return ret;
}
static void
connect_hook(DBusConnection *connection, void *data)
{
DBusError error;
DBusObjectPathVTable vtable = { .message_function = message_handler, };
struct connection_info *info = data;
info->connection = connection;
dbus_error_init(&error);
dbus_bus_request_name(info->connection, info->busname, 0, &error);
if (dbus_error_is_set(&error)) {
ErrorF("[config/dbus] couldn't take over org.x.config: %s (%s)\n",
error.name, error.message);
goto err_start;
}
/* blocks until we get a reply. */
dbus_bus_add_match(info->connection, MATCH_RULE, &error);
if (dbus_error_is_set(&error)) {
ErrorF("[config/dbus] couldn't add match: %s (%s)\n", error.name,
error.message);
goto err_name;
}
if (!dbus_connection_register_object_path(info->connection,
info->busobject, &vtable,
info)) {
ErrorF("[config/dbus] couldn't register object path\n");
goto err_match;
}
DebugF("[dbus] registered %s, %s\n", info->busname, info->busobject);
dbus_error_free(&error);
return;
err_match:
dbus_bus_remove_match(info->connection, MATCH_RULE, &error);
err_name:
dbus_bus_release_name(info->connection, info->busname, &error);
err_start:
dbus_error_free(&error);
reset_info(info);
}
static void
disconnect_hook(void *data)
{
}
#if 0
void
pre_disconnect_hook(void)
{
DBusError error;
dbus_error_init(&error);
dbus_connection_unregister_object_path(connection_data->connection,
connection_data->busobject);
dbus_bus_remove_match(connection_data->connection, MATCH_RULE,
&error);
dbus_bus_release_name(connection_data->connection,
connection_data->busname, &error);
dbus_error_free(&error);
}
#endif
static struct connection_info connection_data;
static struct config_dbus_core_hook core_hook = {
.connect = connect_hook,
.disconnect = disconnect_hook,
.data = &connection_data,
};
int
config_dbus_init(void)
{
snprintf(connection_data.busname, sizeof(connection_data.busname),
"org.x.config.display%d", atoi(display));
snprintf(connection_data.busobject, sizeof(connection_data.busobject),
"/org/x/config/%d", atoi(display));
return config_dbus_core_add_hook(&core_hook);
}
void
config_dbus_fini(void)
{
config_dbus_core_remove_hook(&core_hook);
connection_data.busname[0] = '\0';
connection_data.busobject[0] = '\0';
}
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