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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Dynamic channel
*
* Copyright 2022 David Fort <contact@hardening-consulting.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <freerdp/config.h>
#include <freerdp/log.h>
#include <freerdp/client/channels.h>
#define TAG FREERDP_TAG("genericdynvc")
static UINT generic_on_new_channel_connection(IWTSListenerCallback* pListenerCallback,
IWTSVirtualChannel* pChannel, BYTE* Data,
BOOL* pbAccept,
IWTSVirtualChannelCallback** ppCallback)
{
GENERIC_CHANNEL_CALLBACK* callback = NULL;
GENERIC_DYNVC_PLUGIN* plugin = NULL;
GENERIC_LISTENER_CALLBACK* listener_callback = (GENERIC_LISTENER_CALLBACK*)pListenerCallback;
if (!listener_callback || !listener_callback->plugin)
return ERROR_INTERNAL_ERROR;
plugin = (GENERIC_DYNVC_PLUGIN*)listener_callback->plugin;
WLog_Print(plugin->log, WLOG_TRACE, "...");
callback = (GENERIC_CHANNEL_CALLBACK*)calloc(1, plugin->channelCallbackSize);
if (!callback)
{
WLog_Print(plugin->log, WLOG_ERROR, "calloc failed!");
return CHANNEL_RC_NO_MEMORY;
}
/* implant configured channel callbacks */
callback->iface = *plugin->channel_callbacks;
callback->plugin = listener_callback->plugin;
callback->channel_mgr = listener_callback->channel_mgr;
callback->channel = pChannel;
listener_callback->channel_callback = callback;
*ppCallback = (IWTSVirtualChannelCallback*)callback;
return CHANNEL_RC_OK;
}
static UINT generic_dynvc_plugin_initialize(IWTSPlugin* pPlugin,
IWTSVirtualChannelManager* pChannelMgr)
{
UINT rc = 0;
GENERIC_LISTENER_CALLBACK* listener_callback = NULL;
GENERIC_DYNVC_PLUGIN* plugin = (GENERIC_DYNVC_PLUGIN*)pPlugin;
if (!plugin)
return CHANNEL_RC_BAD_CHANNEL_HANDLE;
if (!pChannelMgr)
return ERROR_INVALID_PARAMETER;
if (plugin->initialized)
{
WLog_ERR(TAG, "[%s] channel initialized twice, aborting", plugin->dynvc_name);
return ERROR_INVALID_DATA;
}
WLog_Print(plugin->log, WLOG_TRACE, "...");
listener_callback = (GENERIC_LISTENER_CALLBACK*)calloc(1, sizeof(GENERIC_LISTENER_CALLBACK));
if (!listener_callback)
{
WLog_Print(plugin->log, WLOG_ERROR, "calloc failed!");
return CHANNEL_RC_NO_MEMORY;
}
plugin->listener_callback = listener_callback;
listener_callback->iface.OnNewChannelConnection = generic_on_new_channel_connection;
listener_callback->plugin = pPlugin;
listener_callback->channel_mgr = pChannelMgr;
rc = pChannelMgr->CreateListener(pChannelMgr, plugin->dynvc_name, 0, &listener_callback->iface,
&plugin->listener);
plugin->listener->pInterface = plugin->iface.pInterface;
plugin->initialized = (rc == CHANNEL_RC_OK);
return rc;
}
static UINT generic_plugin_terminated(IWTSPlugin* pPlugin)
{
GENERIC_DYNVC_PLUGIN* plugin = (GENERIC_DYNVC_PLUGIN*)pPlugin;
UINT error = CHANNEL_RC_OK;
if (!plugin)
return CHANNEL_RC_BAD_CHANNEL_HANDLE;
WLog_Print(plugin->log, WLOG_TRACE, "...");
/* some channels (namely rdpei), look at initialized to see if they should continue to run */
plugin->initialized = FALSE;
if (plugin->terminatePluginFn)
plugin->terminatePluginFn(plugin);
if (plugin->listener_callback)
{
IWTSVirtualChannelManager* mgr = plugin->listener_callback->channel_mgr;
if (mgr)
IFCALL(mgr->DestroyListener, mgr, plugin->listener);
}
free(plugin->listener_callback);
free(plugin->dynvc_name);
free(plugin);
return error;
}
static UINT generic_dynvc_plugin_attached(IWTSPlugin* pPlugin)
{
GENERIC_DYNVC_PLUGIN* pluginn = (GENERIC_DYNVC_PLUGIN*)pPlugin;
UINT error = CHANNEL_RC_OK;
if (!pluginn)
return CHANNEL_RC_BAD_CHANNEL_HANDLE;
pluginn->attached = TRUE;
return error;
}
static UINT generic_dynvc_plugin_detached(IWTSPlugin* pPlugin)
{
GENERIC_DYNVC_PLUGIN* plugin = (GENERIC_DYNVC_PLUGIN*)pPlugin;
UINT error = CHANNEL_RC_OK;
if (!plugin)
return CHANNEL_RC_BAD_CHANNEL_HANDLE;
plugin->attached = FALSE;
return error;
}
UINT freerdp_generic_DVCPluginEntry(IDRDYNVC_ENTRY_POINTS* pEntryPoints, const char* logTag,
const char* name, size_t pluginSize, size_t channelCallbackSize,
const IWTSVirtualChannelCallback* channel_callbacks,
DYNVC_PLUGIN_INIT_FN initPluginFn,
DYNVC_PLUGIN_TERMINATE_FN terminatePluginFn)
{
GENERIC_DYNVC_PLUGIN* plugin = NULL;
UINT error = CHANNEL_RC_INITIALIZATION_ERROR;
WINPR_ASSERT(pEntryPoints);
WINPR_ASSERT(pEntryPoints->GetPlugin);
WINPR_ASSERT(logTag);
WINPR_ASSERT(name);
WINPR_ASSERT(pluginSize >= sizeof(*plugin));
WINPR_ASSERT(channelCallbackSize >= sizeof(GENERIC_CHANNEL_CALLBACK));
plugin = (GENERIC_DYNVC_PLUGIN*)pEntryPoints->GetPlugin(pEntryPoints, name);
if (plugin != NULL)
return CHANNEL_RC_ALREADY_INITIALIZED;
plugin = (GENERIC_DYNVC_PLUGIN*)calloc(1, pluginSize);
if (!plugin)
{
WLog_ERR(TAG, "calloc failed!");
return CHANNEL_RC_NO_MEMORY;
}
plugin->log = WLog_Get(logTag);
plugin->attached = TRUE;
plugin->channel_callbacks = channel_callbacks;
plugin->channelCallbackSize = channelCallbackSize;
plugin->iface.Initialize = generic_dynvc_plugin_initialize;
plugin->iface.Connected = NULL;
plugin->iface.Disconnected = NULL;
plugin->iface.Terminated = generic_plugin_terminated;
plugin->iface.Attached = generic_dynvc_plugin_attached;
plugin->iface.Detached = generic_dynvc_plugin_detached;
plugin->terminatePluginFn = terminatePluginFn;
if (initPluginFn)
{
rdpSettings* settings = pEntryPoints->GetRdpSettings(pEntryPoints);
rdpContext* context = pEntryPoints->GetRdpContext(pEntryPoints);
error = initPluginFn(plugin, context, settings);
if (error != CHANNEL_RC_OK)
goto error;
}
plugin->dynvc_name = _strdup(name);
if (!plugin->dynvc_name)
goto error;
error = pEntryPoints->RegisterPlugin(pEntryPoints, name, &plugin->iface);
if (error == CHANNEL_RC_OK)
return error;
error:
generic_plugin_terminated(&plugin->iface);
return error;
}
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