94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Echo Virtual Channel Extension
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*
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* Copyright 2013 Christian Hofstaedtler
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* Copyright 2015 Thincast Technologies GmbH
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* Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <freerdp/config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <winpr/crt.h>
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#include <winpr/assert.h>
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#include <winpr/stream.h>
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#include "echo_main.h"
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#include <freerdp/client/channels.h>
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#include <freerdp/channels/log.h>
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#include <freerdp/channels/echo.h>
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#define TAG CHANNELS_TAG("echo.client")
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typedef struct
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{
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GENERIC_DYNVC_PLUGIN baseDynPlugin;
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} ECHO_PLUGIN;
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT echo_on_data_received(IWTSVirtualChannelCallback* pChannelCallback, wStream* data)
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{
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GENERIC_CHANNEL_CALLBACK* callback = (GENERIC_CHANNEL_CALLBACK*)pChannelCallback;
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const BYTE* pBuffer = Stream_ConstPointer(data);
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const size_t cbSize = Stream_GetRemainingLength(data);
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WINPR_ASSERT(callback);
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WINPR_ASSERT(callback->channel);
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WINPR_ASSERT(callback->channel->Write);
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if (cbSize > UINT32_MAX)
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return ERROR_INVALID_PARAMETER;
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/* echo back what we have received. ECHO does not have any message IDs. */
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return callback->channel->Write(callback->channel, (ULONG)cbSize, pBuffer, nullptr);
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}
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT echo_on_close(IWTSVirtualChannelCallback* pChannelCallback)
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{
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GENERIC_CHANNEL_CALLBACK* callback = (GENERIC_CHANNEL_CALLBACK*)pChannelCallback;
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free(callback);
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return CHANNEL_RC_OK;
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}
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static const IWTSVirtualChannelCallback echo_callbacks = { echo_on_data_received,
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nullptr, /* Open */
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echo_on_close, nullptr };
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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FREERDP_ENTRY_POINT(UINT VCAPITYPE echo_DVCPluginEntry(IDRDYNVC_ENTRY_POINTS* pEntryPoints))
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{
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return freerdp_generic_DVCPluginEntry(pEntryPoints, TAG, ECHO_DVC_CHANNEL_NAME,
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sizeof(ECHO_PLUGIN), sizeof(GENERIC_CHANNEL_CALLBACK),
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&echo_callbacks, nullptr, nullptr);
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}
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