106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Remote Assistance Virtual Channel - common components
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*
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* Copyright 2024 Armin Novak <armin.novak@thincast.com>
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* Copyright 2024 Thincast Technologies GmbH
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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 "remdesk_common.h"
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#include <freerdp/channels/log.h>
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#define TAG CHANNELS_TAG("remdesk.common")
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UINT remdesk_write_channel_header(wStream* s, const REMDESK_CHANNEL_HEADER* header)
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{
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WCHAR ChannelNameW[32] = WINPR_C_ARRAY_INIT;
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WINPR_ASSERT(s);
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WINPR_ASSERT(header);
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for (size_t 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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const size_t ChannelNameLen =
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(strnlen(header->ChannelName, sizeof(header->ChannelName)) + 1) * sizeof(WCHAR);
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WINPR_ASSERT(ChannelNameLen <= ARRAYSIZE(header->ChannelName));
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Stream_Write_UINT32(s, (UINT32)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 CHANNEL_RC_OK;
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}
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UINT remdesk_write_ctl_header(wStream* s, const REMDESK_CTL_HEADER* ctlHeader)
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{
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WINPR_ASSERT(ctlHeader);
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const UINT error = remdesk_write_channel_header(s, &ctlHeader->ch);
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if (error != 0)
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{
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WLog_ERR(TAG, "remdesk_write_channel_header failed with error %" PRIu32 "!", error);
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return error;
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}
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Stream_Write_UINT32(s, ctlHeader->msgType); /* msgType (4 bytes) */
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return CHANNEL_RC_OK;
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}
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UINT remdesk_read_channel_header(wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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UINT32 ChannelNameLen = 0;
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if (!Stream_CheckAndLogRequiredLength(TAG, s, 8))
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return CHANNEL_RC_NO_MEMORY;
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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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{
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WLog_ERR(TAG, "ChannelNameLen > 64!");
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return ERROR_INVALID_DATA;
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}
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if ((ChannelNameLen % 2) != 0)
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{
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WLog_ERR(TAG, "(ChannelNameLen %% 2) != 0!");
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return ERROR_INVALID_DATA;
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}
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if (Stream_Read_UTF16_String_As_UTF8_Buffer(s, ChannelNameLen / sizeof(WCHAR),
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header->ChannelName,
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ARRAYSIZE(header->ChannelName)) < 0)
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return ERROR_INVALID_DATA;
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return CHANNEL_RC_OK;
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}
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UINT remdesk_prepare_ctl_header(REMDESK_CTL_HEADER* ctlHeader, UINT32 msgType, size_t msgSize)
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{
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WINPR_ASSERT(ctlHeader);
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if (msgSize > UINT32_MAX - 4)
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return ERROR_INVALID_PARAMETER;
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ctlHeader->msgType = msgType;
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(void)sprintf_s(ctlHeader->ch.ChannelName, ARRAYSIZE(ctlHeader->ch.ChannelName),
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REMDESK_CHANNEL_CTL_NAME);
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ctlHeader->ch.DataLength = (UINT32)(4UL + msgSize);
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return CHANNEL_RC_OK;
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}
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