433 lines
10 KiB
C
433 lines
10 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Dynamic Virtual Channel
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*
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* Copyright 2010-2011 Vic Lee
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <winpr/crt.h>
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#include <winpr/stream.h>
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#include <freerdp/constants.h>
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#include <freerdp/utils/svc_plugin.h>
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#include "dvcman.h"
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#include "drdynvc_types.h"
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#include "drdynvc_main.h"
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static int drdynvc_write_variable_uint(wStream* stream, UINT32 val)
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{
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int cb;
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if (val <= 0xFF)
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{
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cb = 0;
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Stream_Write_UINT8(stream, val);
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}
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else if (val <= 0xFFFF)
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{
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cb = 1;
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Stream_Write_UINT16(stream, val);
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}
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else
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{
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cb = 2;
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Stream_Write_UINT32(stream, val);
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}
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return cb;
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}
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int drdynvc_write_data(drdynvcPlugin* drdynvc, UINT32 ChannelId, BYTE* data, UINT32 data_size)
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{
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wStream* data_out;
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UINT32 pos = 0;
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UINT32 cbChId;
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UINT32 cbLen;
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UINT32 chunk_len;
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int error;
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DEBUG_DVC("ChannelId=%d size=%d", ChannelId, data_size);
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if (drdynvc->channel_error != CHANNEL_RC_OK)
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return 1;
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data_out = Stream_New(NULL, CHANNEL_CHUNK_LENGTH);
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Stream_SetPosition(data_out, 1);
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cbChId = drdynvc_write_variable_uint(data_out, ChannelId);
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if (data_size == 0)
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{
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pos = Stream_GetPosition(data_out);
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Stream_SetPosition(data_out, 0);
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Stream_Write_UINT8(data_out, 0x40 | cbChId);
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Stream_SetPosition(data_out, pos);
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error = svc_plugin_send((rdpSvcPlugin*) drdynvc, data_out);
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}
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else if (data_size <= CHANNEL_CHUNK_LENGTH - pos)
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{
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pos = Stream_GetPosition(data_out);
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Stream_SetPosition(data_out, 0);
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Stream_Write_UINT8(data_out, 0x30 | cbChId);
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Stream_SetPosition(data_out, pos);
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Stream_Write(data_out, data, data_size);
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error = svc_plugin_send((rdpSvcPlugin*) drdynvc, data_out);
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}
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else
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{
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/* Fragment the data */
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cbLen = drdynvc_write_variable_uint(data_out, data_size);
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pos = Stream_GetPosition(data_out);
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Stream_SetPosition(data_out, 0);
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Stream_Write_UINT8(data_out, 0x20 | cbChId | (cbLen << 2));
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Stream_SetPosition(data_out, pos);
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chunk_len = CHANNEL_CHUNK_LENGTH - pos;
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Stream_Write(data_out, data, chunk_len);
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data += chunk_len;
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data_size -= chunk_len;
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error = svc_plugin_send((rdpSvcPlugin*) drdynvc, data_out);
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while (error == CHANNEL_RC_OK && data_size > 0)
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{
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data_out = Stream_New(NULL, CHANNEL_CHUNK_LENGTH);
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Stream_SetPosition(data_out, 1);
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cbChId = drdynvc_write_variable_uint(data_out, ChannelId);
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pos = Stream_GetPosition(data_out);
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Stream_SetPosition(data_out, 0);
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Stream_Write_UINT8(data_out, 0x30 | cbChId);
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Stream_SetPosition(data_out, pos);
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chunk_len = data_size;
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if (chunk_len > CHANNEL_CHUNK_LENGTH - pos)
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chunk_len = CHANNEL_CHUNK_LENGTH - pos;
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Stream_Write(data_out, data, chunk_len);
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data += chunk_len;
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data_size -= chunk_len;
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error = svc_plugin_send((rdpSvcPlugin*)drdynvc, data_out);
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}
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}
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if (error != CHANNEL_RC_OK)
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{
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drdynvc->channel_error = error;
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DEBUG_WARN("VirtualChannelWrite failed %d", error);
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return 1;
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}
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return 0;
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}
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int drdynvc_push_event(drdynvcPlugin* drdynvc, wMessage* event)
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{
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int error;
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error = svc_plugin_send_event((rdpSvcPlugin*) drdynvc, event);
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if (error != CHANNEL_RC_OK)
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{
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DEBUG_WARN("pVirtualChannelEventPush failed %d", error);
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return 1;
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}
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return 0;
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}
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static int drdynvc_process_capability_request(drdynvcPlugin* drdynvc, int Sp, int cbChId, wStream* s)
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{
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wStream* data_out;
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int error;
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DEBUG_DVC("Sp=%d cbChId=%d", Sp, cbChId);
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Stream_Seek(s, 1); /* pad */
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Stream_Read_UINT16(s, drdynvc->version);
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/* RDP8 servers offer version 3, though Microsoft forgot to document it
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* in their early documents. It behaves the same as version 2.
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*/
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if ((drdynvc->version == 2) || (drdynvc->version == 3))
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{
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Stream_Read_UINT16(s, drdynvc->PriorityCharge0);
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Stream_Read_UINT16(s, drdynvc->PriorityCharge1);
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Stream_Read_UINT16(s, drdynvc->PriorityCharge2);
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Stream_Read_UINT16(s, drdynvc->PriorityCharge3);
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}
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data_out = Stream_New(NULL, 4);
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Stream_Write_UINT16(data_out, 0x0050); /* Cmd+Sp+cbChId+Pad. Note: MSTSC sends 0x005c */
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Stream_Write_UINT16(data_out, drdynvc->version);
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error = svc_plugin_send((rdpSvcPlugin*) drdynvc, data_out);
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if (error != CHANNEL_RC_OK)
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{
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DEBUG_WARN("VirtualChannelWrite failed %d", error);
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return 1;
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}
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drdynvc->channel_error = error;
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return 0;
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}
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static UINT32 drdynvc_read_variable_uint(wStream* stream, int cbLen)
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{
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UINT32 val;
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switch (cbLen)
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{
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case 0:
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Stream_Read_UINT8(stream, val);
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break;
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case 1:
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Stream_Read_UINT16(stream, val);
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break;
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default:
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Stream_Read_UINT32(stream, val);
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break;
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}
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return val;
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}
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static int drdynvc_process_create_request(drdynvcPlugin* drdynvc, int Sp, int cbChId, wStream* s)
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{
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int pos;
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int status;
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UINT32 ChannelId;
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wStream* data_out;
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ChannelId = drdynvc_read_variable_uint(s, cbChId);
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pos = Stream_GetPosition(s);
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DEBUG_DVC("ChannelId=%d ChannelName=%s", ChannelId, Stream_Pointer(s));
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status = dvcman_create_channel(drdynvc->channel_mgr, ChannelId, (char*) Stream_Pointer(s));
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data_out = Stream_New(NULL, pos + 4);
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Stream_Write_UINT8(data_out, 0x10 | cbChId);
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Stream_SetPosition(s, 1);
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Stream_Copy(data_out, s, pos - 1);
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if (status == 0)
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{
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DEBUG_DVC("channel created");
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Stream_Write_UINT32(data_out, 0);
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}
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else
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{
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DEBUG_DVC("no listener");
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Stream_Write_UINT32(data_out, (UINT32)(-1));
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}
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status = svc_plugin_send((rdpSvcPlugin*) drdynvc, data_out);
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if (status != CHANNEL_RC_OK)
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{
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DEBUG_WARN("VirtualChannelWrite failed %d", status);
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return 1;
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}
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return 0;
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}
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static int drdynvc_process_data_first(drdynvcPlugin* drdynvc, int Sp, int cbChId, wStream* s)
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{
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int status;
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UINT32 Length;
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UINT32 ChannelId;
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ChannelId = drdynvc_read_variable_uint(s, cbChId);
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Length = drdynvc_read_variable_uint(s, Sp);
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DEBUG_DVC("ChannelId=%d Length=%d", ChannelId, Length);
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status = dvcman_receive_channel_data_first(drdynvc->channel_mgr, ChannelId, Length);
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if (status)
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return status;
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return dvcman_receive_channel_data(drdynvc->channel_mgr, ChannelId,
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Stream_Pointer(s), Stream_GetRemainingLength(s));
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}
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static int drdynvc_process_data(drdynvcPlugin* drdynvc, int Sp, int cbChId, wStream* s)
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{
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UINT32 ChannelId;
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ChannelId = drdynvc_read_variable_uint(s, cbChId);
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DEBUG_DVC("ChannelId=%d", ChannelId);
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return dvcman_receive_channel_data(drdynvc->channel_mgr, ChannelId,
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Stream_Pointer(s), Stream_GetRemainingLength(s));
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}
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static int drdynvc_process_close_request(drdynvcPlugin* drdynvc, int Sp, int cbChId, wStream* s)
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{
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UINT32 ChannelId;
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ChannelId = drdynvc_read_variable_uint(s, cbChId);
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DEBUG_DVC("ChannelId=%d", ChannelId);
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dvcman_close_channel(drdynvc->channel_mgr, ChannelId);
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return 0;
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}
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static void drdynvc_process_receive(rdpSvcPlugin* plugin, wStream* s)
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{
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int value;
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int Cmd;
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int Sp;
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int cbChId;
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drdynvcPlugin* drdynvc = (drdynvcPlugin*) plugin;
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Stream_Read_UINT8(s, value);
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Cmd = (value & 0xf0) >> 4;
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Sp = (value & 0x0c) >> 2;
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cbChId = (value & 0x03) >> 0;
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DEBUG_DVC("Cmd=0x%x", Cmd);
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switch (Cmd)
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{
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case CAPABILITY_REQUEST_PDU:
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drdynvc_process_capability_request(drdynvc, Sp, cbChId, s);
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break;
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case CREATE_REQUEST_PDU:
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drdynvc_process_create_request(drdynvc, Sp, cbChId, s);
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break;
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case DATA_FIRST_PDU:
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drdynvc_process_data_first(drdynvc, Sp, cbChId, s);
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break;
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case DATA_PDU:
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drdynvc_process_data(drdynvc, Sp, cbChId, s);
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break;
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case CLOSE_REQUEST_PDU:
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drdynvc_process_close_request(drdynvc, Sp, cbChId, s);
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break;
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default:
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DEBUG_WARN("unknown drdynvc cmd 0x%x", Cmd);
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break;
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}
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Stream_Free(s, TRUE);
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}
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static void drdynvc_process_connect(rdpSvcPlugin* plugin)
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{
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int index;
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ADDIN_ARGV* args;
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rdpSettings* settings;
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drdynvcPlugin* drdynvc = (drdynvcPlugin*)plugin;
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DEBUG_DVC("connecting");
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drdynvc->channel_mgr = dvcman_new(drdynvc);
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drdynvc->channel_error = 0;
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settings = (rdpSettings*) ((rdpSvcPlugin*) plugin)->channel_entry_points.pExtendedData;
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for (index = 0; index < settings->DynamicChannelCount; index++)
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{
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args = settings->DynamicChannelArray[index];
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dvcman_load_addin(drdynvc->channel_mgr, args);
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}
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dvcman_init(drdynvc->channel_mgr);
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}
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static void drdynvc_process_event(rdpSvcPlugin* plugin, wMessage* event)
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{
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freerdp_event_free(event);
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}
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static void drdynvc_process_terminate(rdpSvcPlugin* plugin)
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{
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drdynvcPlugin* drdynvc = (drdynvcPlugin*) plugin;
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DEBUG_DVC("terminating");
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if (drdynvc->channel_mgr)
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dvcman_free(drdynvc->channel_mgr);
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free(drdynvc);
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}
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/**
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* Channel Client Interface
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*/
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int drdynvc_get_version(DrdynvcClientContext* context)
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{
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drdynvcPlugin* drdynvc = (drdynvcPlugin*) context->handle;
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return drdynvc->version;
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}
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/* drdynvc is always built-in */
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#define VirtualChannelEntry drdynvc_VirtualChannelEntry
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int VirtualChannelEntry(PCHANNEL_ENTRY_POINTS pEntryPoints)
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{
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drdynvcPlugin* _p;
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DrdynvcClientContext* context;
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CHANNEL_ENTRY_POINTS_EX* pEntryPointsEx;
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_p = (drdynvcPlugin*) malloc(sizeof(drdynvcPlugin));
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ZeroMemory(_p, sizeof(drdynvcPlugin));
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_p->plugin.channel_def.options =
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CHANNEL_OPTION_INITIALIZED |
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CHANNEL_OPTION_ENCRYPT_RDP |
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CHANNEL_OPTION_COMPRESS_RDP;
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strcpy(_p->plugin.channel_def.name, "drdynvc");
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_p->plugin.connect_callback = drdynvc_process_connect;
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_p->plugin.receive_callback = drdynvc_process_receive;
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_p->plugin.event_callback = drdynvc_process_event;
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_p->plugin.terminate_callback = drdynvc_process_terminate;
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pEntryPointsEx = (CHANNEL_ENTRY_POINTS_EX*) pEntryPoints;
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if ((pEntryPointsEx->cbSize >= sizeof(CHANNEL_ENTRY_POINTS_EX)) &&
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(pEntryPointsEx->MagicNumber == FREERDP_CHANNEL_MAGIC_NUMBER))
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{
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context = (DrdynvcClientContext*) malloc(sizeof(DrdynvcClientContext));
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context->handle = (void*) _p;
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_p->context = context;
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context->GetVersion = drdynvc_get_version;
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*(pEntryPointsEx->ppInterface) = (void*) context;
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}
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svc_plugin_init((rdpSvcPlugin*) _p, pEntryPoints);
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return 1;
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}
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