354 lines
8.8 KiB
C
354 lines
8.8 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol client.
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <freerdp/constants.h>
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#include <freerdp/utils/memory.h>
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#include <freerdp/utils/stream.h>
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#include <freerdp/utils/svc_plugin.h>
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#include <freerdp/utils/wait_obj.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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#define CREATE_REQUEST_PDU 0x01
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#define DATA_FIRST_PDU 0x02
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#define DATA_PDU 0x03
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#define CLOSE_REQUEST_PDU 0x04
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#define CAPABILITY_REQUEST_PDU 0x05
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struct drdynvc_plugin
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{
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rdpSvcPlugin plugin;
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int version;
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int PriorityCharge0;
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int PriorityCharge1;
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int PriorityCharge2;
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int PriorityCharge3;
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IWTSVirtualChannelManager* channel_mgr;
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};
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static int drdynvc_write_variable_uint(STREAM* 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 = 3;
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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, char* data, uint32 data_size)
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{
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STREAM* 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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data_out = stream_new(CHANNEL_CHUNK_LENGTH);
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stream_set_pos(data_out, 1);
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cbChId = drdynvc_write_variable_uint(data_out, ChannelId);
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if (data_size <= CHANNEL_CHUNK_LENGTH - pos)
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{
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pos = stream_get_pos(data_out);
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stream_set_pos(data_out, 0);
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stream_write_uint8(data_out, 0x30 | cbChId);
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stream_set_pos(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_get_pos(data_out);
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stream_set_pos(data_out, 0);
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stream_write_uint8(data_out, 0x20 | cbChId | (cbLen << 2));
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stream_set_pos(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(CHANNEL_CHUNK_LENGTH);
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stream_set_pos(data_out, 1);
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cbChId = drdynvc_write_variable_uint(data_out, ChannelId);
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pos = stream_get_pos(data_out);
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stream_set_pos(data_out, 0);
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stream_write_uint8(data_out, 0x30 | cbChId);
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stream_set_pos(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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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, RDP_EVENT* 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, STREAM* data_in)
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{
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STREAM* 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(data_in, 1); /* pad */
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stream_read_uint16(data_in, drdynvc->version);
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if (drdynvc->version == 2)
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{
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stream_read_uint16(data_in, drdynvc->PriorityCharge0);
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stream_read_uint16(data_in, drdynvc->PriorityCharge1);
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stream_read_uint16(data_in, drdynvc->PriorityCharge2);
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stream_read_uint16(data_in, drdynvc->PriorityCharge3);
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}
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data_out = stream_new(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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return 0;
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}
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static uint32 drdynvc_read_variable_uint(STREAM* 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, STREAM* data_in)
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{
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STREAM* data_out;
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int pos;
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int error;
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uint32 ChannelId;
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ChannelId = drdynvc_read_variable_uint(data_in, cbChId);
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pos = stream_get_pos(data_in);
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DEBUG_DVC("ChannelId=%d ChannelName=%s", ChannelId, stream_get_tail(data_in));
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error = dvcman_create_channel(drdynvc->channel_mgr, ChannelId, (char*)stream_get_tail(data_in));
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data_out = stream_new(pos + 4);
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stream_write_uint8(data_out, 0x10 | cbChId);
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stream_set_pos(data_in, 1);
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stream_copy(data_out, data_in, pos - 1);
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if (error == 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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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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return 0;
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}
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static int drdynvc_process_data_first(drdynvcPlugin* drdynvc, int Sp, int cbChId, STREAM* data_in, int in_length)
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{
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int pos;
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uint32 ChannelId;
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uint32 Length;
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int error;
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ChannelId = drdynvc_read_variable_uint(data_in, cbChId);
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Length = drdynvc_read_variable_uint(data_in, Sp);
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pos = stream_get_pos(data_in);
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DEBUG_DVC("ChannelId=%d Length=%d", ChannelId, Length);
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error = dvcman_receive_channel_data_first(drdynvc->channel_mgr, ChannelId, Length);
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if (error)
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return error;
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return dvcman_receive_channel_data(drdynvc->channel_mgr, ChannelId,
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stream_get_tail(data_in), in_length - pos);
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}
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static int drdynvc_process_data(drdynvcPlugin* drdynvc, int Sp, int cbChId, STREAM* data_in, int in_length)
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{
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int pos;
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uint32 ChannelId;
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ChannelId = drdynvc_read_variable_uint(data_in, cbChId);
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pos = stream_get_pos(data_in);
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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_get_tail(data_in), in_length - pos);
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}
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static int drdynvc_process_close_request(drdynvcPlugin* drdynvc, int Sp, int cbChId, STREAM* data_in)
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{
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uint32 ChannelId;
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ChannelId = drdynvc_read_variable_uint(data_in, 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, STREAM* data_in)
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{
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drdynvcPlugin* drdynvc = (drdynvcPlugin*)plugin;
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int in_length;
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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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in_length = stream_get_length(data_in);
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stream_set_pos(data_in, 0);
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stream_read_uint8(data_in, 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("in_length=%d Cmd=0x%x", in_length, 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, data_in);
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break;
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case CREATE_REQUEST_PDU:
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drdynvc_process_create_request(drdynvc, Sp, cbChId, data_in);
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break;
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case DATA_FIRST_PDU:
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drdynvc_process_data_first(drdynvc, Sp, cbChId, data_in, in_length);
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break;
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case DATA_PDU:
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drdynvc_process_data(drdynvc, Sp, cbChId, data_in, in_length);
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break;
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case CLOSE_REQUEST_PDU:
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drdynvc_process_close_request(drdynvc, Sp, cbChId, data_in);
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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(data_in);
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}
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static void drdynvc_process_connect(rdpSvcPlugin* plugin)
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{
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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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dvcman_load_plugin(drdynvc->channel_mgr, svc_plugin_get_data(plugin));
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dvcman_init(drdynvc->channel_mgr);
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}
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static void drdynvc_process_event(rdpSvcPlugin* plugin, RDP_EVENT* 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 != NULL)
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dvcman_free(drdynvc->channel_mgr);
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xfree(drdynvc);
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}
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DEFINE_SVC_PLUGIN(drdynvc, "drdynvc",
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CHANNEL_OPTION_INITIALIZED | CHANNEL_OPTION_ENCRYPT_RDP |
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CHANNEL_OPTION_COMPRESS_RDP)
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