2014-06-29 01:24:44 +04:00
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/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Remote Assistance Virtual Channel
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*
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* Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <winpr/crt.h>
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#include <winpr/print.h>
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#include <winpr/stream.h>
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#include "remdesk_main.h"
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2014-07-16 02:38:32 +04:00
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int remdesk_virtual_channel_write(RemdeskServerContext* context, wStream* s)
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{
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BOOL status;
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ULONG BytesWritten = 0;
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status = WTSVirtualChannelWrite(context->priv->ChannelHandle,
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(PCHAR) Stream_Buffer(s), Stream_Length(s), &BytesWritten);
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return (status) ? 1 : -1;
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}
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static int remdesk_read_channel_header(wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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int status;
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UINT32 ChannelNameLen;
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char* pChannelName = NULL;
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if (Stream_GetRemainingLength(s) < 8)
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return -1;
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Stream_Read_UINT32(s, ChannelNameLen); /* ChannelNameLen (4 bytes) */
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Stream_Read_UINT32(s, header->DataLength); /* DataLen (4 bytes) */
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if (ChannelNameLen > 64)
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return -1;
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if ((ChannelNameLen % 2) != 0)
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return -1;
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if (Stream_GetRemainingLength(s) < ChannelNameLen)
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return -1;
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ZeroMemory(header->ChannelName, sizeof(header->ChannelName));
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pChannelName = (char*) header->ChannelName;
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status = ConvertFromUnicode(CP_UTF8, 0, (WCHAR*) Stream_Pointer(s),
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ChannelNameLen / 2, &pChannelName, 32, NULL, NULL);
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Stream_Seek(s, ChannelNameLen);
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if (status <= 0)
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return -1;
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return 1;
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}
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static int remdesk_write_channel_header(wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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int index;
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UINT32 ChannelNameLen;
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WCHAR ChannelNameW[32];
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ZeroMemory(ChannelNameW, sizeof(ChannelNameW));
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for (index = 0; index < 32; index++)
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{
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ChannelNameW[index] = (WCHAR) header->ChannelName[index];
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}
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ChannelNameLen = (strlen(header->ChannelName) + 1) * 2;
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Stream_Write_UINT32(s, ChannelNameLen); /* ChannelNameLen (4 bytes) */
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Stream_Write_UINT32(s, header->DataLength); /* DataLen (4 bytes) */
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Stream_Write(s, ChannelNameW, ChannelNameLen); /* ChannelName (variable) */
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return 1;
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}
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static int remdesk_write_ctl_header(wStream* s, REMDESK_CTL_HEADER* ctlHeader)
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{
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remdesk_write_channel_header(s, (REMDESK_CHANNEL_HEADER*) ctlHeader);
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Stream_Write_UINT32(s, ctlHeader->msgType); /* msgType (4 bytes) */
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return 1;
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}
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static int remdesk_prepare_ctl_header(REMDESK_CTL_HEADER* ctlHeader, UINT32 msgType, UINT32 msgSize)
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{
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ctlHeader->msgType = msgType;
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strcpy(ctlHeader->ChannelName, REMDESK_CHANNEL_CTL_NAME);
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ctlHeader->DataLength = 4 + msgSize;
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return 1;
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}
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static int remdesk_send_ctl_result_pdu(RemdeskServerContext* context, UINT32 result)
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{
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wStream* s;
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REMDESK_CTL_RESULT_PDU pdu;
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pdu.result = result;
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remdesk_prepare_ctl_header(&(pdu.ctlHeader), REMDESK_CTL_RESULT, 4);
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s = Stream_New(NULL, REMDESK_CHANNEL_CTL_SIZE + pdu.ctlHeader.DataLength);
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remdesk_write_ctl_header(s, &(pdu.ctlHeader));
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Stream_Write_UINT32(s, pdu.result); /* result (4 bytes) */
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Stream_SealLength(s);
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remdesk_virtual_channel_write(context, s);
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Stream_Free(s, TRUE);
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return 1;
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}
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static int remdesk_send_ctl_version_info_pdu(RemdeskServerContext* context)
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{
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wStream* s;
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REMDESK_CTL_VERSION_INFO_PDU pdu;
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remdesk_prepare_ctl_header(&(pdu.ctlHeader), REMDESK_CTL_VERSIONINFO, 8);
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pdu.versionMajor = 1;
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pdu.versionMinor = 2;
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s = Stream_New(NULL, REMDESK_CHANNEL_CTL_SIZE + pdu.ctlHeader.DataLength);
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remdesk_write_ctl_header(s, &(pdu.ctlHeader));
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Stream_Write_UINT32(s, pdu.versionMajor); /* versionMajor (4 bytes) */
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Stream_Write_UINT32(s, pdu.versionMinor); /* versionMinor (4 bytes) */
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Stream_SealLength(s);
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remdesk_virtual_channel_write(context, s);
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return 1;
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}
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static int remdesk_recv_ctl_version_info_pdu(RemdeskServerContext* context, wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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UINT32 versionMajor;
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UINT32 versionMinor;
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if (Stream_GetRemainingLength(s) < 8)
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return -1;
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Stream_Read_UINT32(s, versionMajor); /* versionMajor (4 bytes) */
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Stream_Read_UINT32(s, versionMinor); /* versionMinor (4 bytes) */
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return 1;
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}
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static int remdesk_recv_ctl_remote_control_desktop_pdu(RemdeskServerContext* context, wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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int status;
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int cchStringW;
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WCHAR* pStringW;
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UINT32 msgLength;
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int cbRaConnectionStringW = 0;
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WCHAR* raConnectionStringW = NULL;
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REMDESK_CTL_REMOTE_CONTROL_DESKTOP_PDU pdu;
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msgLength = header->DataLength - 4;
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pStringW = (WCHAR*) Stream_Pointer(s);
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raConnectionStringW = pStringW;
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cchStringW = 0;
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while ((msgLength > 0) && pStringW[cchStringW])
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{
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msgLength -= 2;
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cchStringW++;
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}
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if (pStringW[cchStringW] || !cchStringW)
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return -1;
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cchStringW++;
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cbRaConnectionStringW = cchStringW * 2;
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pdu.raConnectionString = NULL;
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status = ConvertFromUnicode(CP_UTF8, 0, raConnectionStringW,
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cbRaConnectionStringW / 2, &pdu.raConnectionString, 0, NULL, NULL);
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if (status <= 0)
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return -1;
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2014-09-12 18:19:32 +04:00
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WLog_INFO(TAG, "RaConnectionString: %s",
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pdu.raConnectionString);
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2014-07-16 02:38:32 +04:00
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free(pdu.raConnectionString);
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remdesk_send_ctl_result_pdu(context, 0);
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return 1;
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}
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static int remdesk_recv_ctl_authenticate_pdu(RemdeskServerContext* context, wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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int status;
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int cchStringW;
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WCHAR* pStringW;
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UINT32 msgLength;
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int cbExpertBlobW = 0;
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WCHAR* expertBlobW = NULL;
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int cbRaConnectionStringW = 0;
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WCHAR* raConnectionStringW = NULL;
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REMDESK_CTL_AUTHENTICATE_PDU pdu;
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msgLength = header->DataLength - 4;
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pStringW = (WCHAR*) Stream_Pointer(s);
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raConnectionStringW = pStringW;
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cchStringW = 0;
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while ((msgLength > 0) && pStringW[cchStringW])
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{
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msgLength -= 2;
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cchStringW++;
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}
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if (pStringW[cchStringW] || !cchStringW)
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return -1;
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cchStringW++;
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cbRaConnectionStringW = cchStringW * 2;
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pStringW += cchStringW;
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expertBlobW = pStringW;
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cchStringW = 0;
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while ((msgLength > 0) && pStringW[cchStringW])
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{
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msgLength -= 2;
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cchStringW++;
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}
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if (pStringW[cchStringW] || !cchStringW)
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return -1;
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cchStringW++;
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cbExpertBlobW = cchStringW * 2;
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pdu.raConnectionString = NULL;
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status = ConvertFromUnicode(CP_UTF8, 0, raConnectionStringW,
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cbRaConnectionStringW / 2, &pdu.raConnectionString, 0, NULL, NULL);
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if (status <= 0)
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return -1;
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pdu.expertBlob = NULL;
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status = ConvertFromUnicode(CP_UTF8, 0, expertBlobW,
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cbExpertBlobW / 2, &pdu.expertBlob, 0, NULL, NULL);
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if (status <= 0)
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return -1;
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2014-09-12 18:19:32 +04:00
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WLog_INFO(TAG, "RaConnectionString: %s ExpertBlob: %s",
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pdu.raConnectionString, pdu.expertBlob);
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2014-07-16 02:38:32 +04:00
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free(pdu.raConnectionString);
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free(pdu.expertBlob);
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return 1;
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}
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static int remdesk_recv_ctl_verify_password_pdu(RemdeskServerContext* context, wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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int status;
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int cbExpertBlobW = 0;
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WCHAR* expertBlobW = NULL;
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REMDESK_CTL_VERIFY_PASSWORD_PDU pdu;
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if (Stream_GetRemainingLength(s) < 8)
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return -1;
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pdu.expertBlob = NULL;
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expertBlobW = (WCHAR*) Stream_Pointer(s);
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cbExpertBlobW = header->DataLength - 4;
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status = ConvertFromUnicode(CP_UTF8, 0, expertBlobW, cbExpertBlobW / 2, &pdu.expertBlob, 0, NULL, NULL);
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2014-09-12 18:19:32 +04:00
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WLog_INFO(TAG, "ExpertBlob: %s", pdu.expertBlob);
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2014-07-16 02:38:32 +04:00
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remdesk_send_ctl_result_pdu(context, 0);
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return 1;
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}
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static int remdesk_recv_ctl_pdu(RemdeskServerContext* context, wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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int status = 1;
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UINT32 msgType = 0;
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if (Stream_GetRemainingLength(s) < 4)
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return -1;
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Stream_Read_UINT32(s, msgType); /* msgType (4 bytes) */
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2014-09-12 18:19:32 +04:00
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WLog_INFO(TAG, "msgType: %d", msgType);
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2014-07-16 02:38:32 +04:00
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switch (msgType)
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{
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case REMDESK_CTL_REMOTE_CONTROL_DESKTOP:
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status = remdesk_recv_ctl_remote_control_desktop_pdu(context, s, header);
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break;
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case REMDESK_CTL_AUTHENTICATE:
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status = remdesk_recv_ctl_authenticate_pdu(context, s, header);
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break;
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case REMDESK_CTL_DISCONNECT:
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break;
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case REMDESK_CTL_VERSIONINFO:
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status = remdesk_recv_ctl_version_info_pdu(context, s, header);
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break;
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case REMDESK_CTL_ISCONNECTED:
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break;
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case REMDESK_CTL_VERIFY_PASSWORD:
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status = remdesk_recv_ctl_verify_password_pdu(context, s, header);
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break;
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case REMDESK_CTL_EXPERT_ON_VISTA:
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break;
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case REMDESK_CTL_RANOVICE_NAME:
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break;
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case REMDESK_CTL_RAEXPERT_NAME:
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break;
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case REMDESK_CTL_TOKEN:
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break;
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default:
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2014-09-12 18:19:32 +04:00
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WLog_ERR(TAG, "remdesk_recv_control_pdu: unknown msgType: %d", msgType);
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2014-07-16 02:38:32 +04:00
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status = -1;
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break;
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}
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return status;
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}
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2014-06-29 01:24:44 +04:00
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static int remdesk_server_receive_pdu(RemdeskServerContext* context, wStream* s)
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{
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2014-07-16 02:38:32 +04:00
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int status = 1;
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REMDESK_CHANNEL_HEADER header;
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#if 0
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2014-09-12 18:19:32 +04:00
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WLog_INFO(TAG, "RemdeskReceive: %d", Stream_GetRemainingLength(s));
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2014-07-16 02:38:32 +04:00
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|
|
winpr_HexDump(Stream_Pointer(s), Stream_GetRemainingLength(s));
|
|
|
|
#endif
|
|
|
|
|
|
|
|
remdesk_read_channel_header(s, &header);
|
|
|
|
|
|
|
|
if (strcmp(header.ChannelName, "RC_CTL") == 0)
|
|
|
|
{
|
|
|
|
status = remdesk_recv_ctl_pdu(context, s, &header);
|
|
|
|
}
|
|
|
|
else if (strcmp(header.ChannelName, "70") == 0)
|
|
|
|
{
|
|
|
|
|
|
|
|
}
|
|
|
|
else if (strcmp(header.ChannelName, "71") == 0)
|
|
|
|
{
|
|
|
|
|
|
|
|
}
|
|
|
|
else if (strcmp(header.ChannelName, ".") == 0)
|
|
|
|
{
|
|
|
|
|
|
|
|
}
|
|
|
|
else if (strcmp(header.ChannelName, "1000.") == 0)
|
|
|
|
{
|
|
|
|
|
|
|
|
}
|
|
|
|
else if (strcmp(header.ChannelName, "RA_FX") == 0)
|
|
|
|
{
|
|
|
|
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
2014-06-29 01:24:44 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static void* remdesk_server_thread(void* arg)
|
|
|
|
{
|
|
|
|
wStream* s;
|
|
|
|
DWORD status;
|
|
|
|
DWORD nCount;
|
|
|
|
void* buffer;
|
2014-07-16 02:38:32 +04:00
|
|
|
UINT32* pHeader;
|
|
|
|
UINT32 PduLength;
|
2014-06-29 01:24:44 +04:00
|
|
|
HANDLE events[8];
|
|
|
|
HANDLE ChannelEvent;
|
|
|
|
DWORD BytesReturned;
|
|
|
|
RemdeskServerContext* context;
|
|
|
|
|
|
|
|
context = (RemdeskServerContext*) arg;
|
|
|
|
|
|
|
|
buffer = NULL;
|
|
|
|
BytesReturned = 0;
|
|
|
|
ChannelEvent = NULL;
|
|
|
|
|
|
|
|
s = Stream_New(NULL, 4096);
|
|
|
|
|
|
|
|
if (WTSVirtualChannelQuery(context->priv->ChannelHandle, WTSVirtualEventHandle, &buffer, &BytesReturned) == TRUE)
|
|
|
|
{
|
|
|
|
if (BytesReturned == sizeof(HANDLE))
|
|
|
|
CopyMemory(&ChannelEvent, buffer, sizeof(HANDLE));
|
|
|
|
|
|
|
|
WTSFreeMemory(buffer);
|
|
|
|
}
|
|
|
|
|
|
|
|
nCount = 0;
|
|
|
|
events[nCount++] = ChannelEvent;
|
|
|
|
events[nCount++] = context->priv->StopEvent;
|
|
|
|
|
2014-07-16 02:38:32 +04:00
|
|
|
remdesk_send_ctl_version_info_pdu(context);
|
|
|
|
|
2014-06-29 01:24:44 +04:00
|
|
|
while (1)
|
|
|
|
{
|
|
|
|
status = WaitForMultipleObjects(nCount, events, FALSE, INFINITE);
|
|
|
|
|
|
|
|
if (WaitForSingleObject(context->priv->StopEvent, 0) == WAIT_OBJECT_0)
|
|
|
|
{
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (WTSVirtualChannelRead(context->priv->ChannelHandle, 0,
|
|
|
|
(PCHAR) Stream_Buffer(s), Stream_Capacity(s), &BytesReturned))
|
|
|
|
{
|
|
|
|
if (BytesReturned)
|
|
|
|
Stream_Seek(s, BytesReturned);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
Stream_EnsureRemainingCapacity(s, BytesReturned);
|
|
|
|
}
|
|
|
|
|
2014-07-16 02:38:32 +04:00
|
|
|
if (Stream_GetPosition(s) >= 8)
|
2014-06-29 01:24:44 +04:00
|
|
|
{
|
2014-07-16 02:38:32 +04:00
|
|
|
pHeader = (UINT32*) Stream_Buffer(s);
|
|
|
|
PduLength = pHeader[0] + pHeader[1] + 8;
|
|
|
|
|
|
|
|
if (PduLength >= Stream_GetPosition(s))
|
|
|
|
{
|
|
|
|
Stream_SealLength(s);
|
|
|
|
Stream_SetPosition(s, 0);
|
|
|
|
remdesk_server_receive_pdu(context, s);
|
|
|
|
Stream_SetPosition(s, 0);
|
|
|
|
}
|
2014-06-29 01:24:44 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
Stream_Free(s, TRUE);
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int remdesk_server_start(RemdeskServerContext* context)
|
|
|
|
{
|
|
|
|
context->priv->ChannelHandle = WTSVirtualChannelOpen(context->vcm, WTS_CURRENT_SESSION, "remdesk");
|
|
|
|
|
|
|
|
if (!context->priv->ChannelHandle)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
context->priv->StopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
|
|
|
|
|
|
|
|
context->priv->Thread = CreateThread(NULL, 0,
|
|
|
|
(LPTHREAD_START_ROUTINE) remdesk_server_thread, (void*) context, 0, NULL);
|
|
|
|
|
2014-07-16 02:38:32 +04:00
|
|
|
return 1;
|
2014-06-29 01:24:44 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static int remdesk_server_stop(RemdeskServerContext* context)
|
|
|
|
{
|
|
|
|
SetEvent(context->priv->StopEvent);
|
|
|
|
|
|
|
|
WaitForSingleObject(context->priv->Thread, INFINITE);
|
|
|
|
CloseHandle(context->priv->Thread);
|
|
|
|
|
2014-07-16 02:38:32 +04:00
|
|
|
return 1;
|
2014-06-29 01:24:44 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
RemdeskServerContext* remdesk_server_context_new(HANDLE vcm)
|
|
|
|
{
|
|
|
|
RemdeskServerContext* context;
|
|
|
|
|
|
|
|
context = (RemdeskServerContext*) calloc(1, sizeof(RemdeskServerContext));
|
|
|
|
|
|
|
|
if (context)
|
|
|
|
{
|
|
|
|
context->vcm = vcm;
|
|
|
|
|
|
|
|
context->Start = remdesk_server_start;
|
|
|
|
context->Stop = remdesk_server_stop;
|
|
|
|
|
|
|
|
context->priv = (RemdeskServerPrivate*) calloc(1, sizeof(RemdeskServerPrivate));
|
|
|
|
|
|
|
|
if (context->priv)
|
|
|
|
{
|
2014-07-16 02:38:32 +04:00
|
|
|
context->priv->Version = 1;
|
2014-06-29 01:24:44 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return context;
|
|
|
|
}
|
|
|
|
|
|
|
|
void remdesk_server_context_free(RemdeskServerContext* context)
|
|
|
|
{
|
|
|
|
if (context)
|
|
|
|
{
|
|
|
|
if (context->priv)
|
|
|
|
{
|
|
|
|
free(context->priv);
|
|
|
|
}
|
|
|
|
|
|
|
|
free(context);
|
|
|
|
}
|
|
|
|
}
|