FreeRDP/channels/drdynvc/drdynvc_main.c

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/**
* FreeRDP: A Remote Desktop Protocol client.
* Dynamic Virtual Channel
*
* Copyright 2010-2011 Vic Lee
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <freerdp/constants.h>
#include <freerdp/utils/memory.h>
#include <freerdp/utils/stream.h>
#include <freerdp/utils/svc_plugin.h>
#include <freerdp/utils/wait_obj.h>
#include "dvcman.h"
#include "drdynvc_types.h"
#include "drdynvc_main.h"
#define CREATE_REQUEST_PDU 0x01
#define DATA_FIRST_PDU 0x02
#define DATA_PDU 0x03
#define CLOSE_REQUEST_PDU 0x04
#define CAPABILITY_REQUEST_PDU 0x05
struct drdynvc_plugin
{
rdpSvcPlugin plugin;
int version;
int PriorityCharge0;
int PriorityCharge1;
int PriorityCharge2;
int PriorityCharge3;
IWTSVirtualChannelManager* channel_mgr;
};
static int drdynvc_write_variable_uint(STREAM* stream, uint32 val)
{
int cb;
if (val <= 0xFF)
{
cb = 0;
stream_write_uint8(stream, val);
}
else if (val <= 0xFFFF)
{
cb = 1;
stream_write_uint16(stream, val);
}
else
{
cb = 3;
stream_write_uint32(stream, val);
}
return cb;
}
int drdynvc_write_data(drdynvcPlugin* drdynvc, uint32 ChannelId, char* data, uint32 data_size)
{
STREAM* data_out;
uint32 pos = 0;
uint32 cbChId;
uint32 cbLen;
uint32 chunk_len;
int error;
DEBUG_DVC("ChannelId=%d size=%d", ChannelId, data_size);
data_out = stream_new(CHANNEL_CHUNK_LENGTH);
stream_set_pos(data_out, 1);
cbChId = drdynvc_write_variable_uint(data_out, ChannelId);
if (data_size <= CHANNEL_CHUNK_LENGTH - pos)
{
pos = stream_get_pos(data_out);
stream_set_pos(data_out, 0);
stream_write_uint8(data_out, 0x30 | cbChId);
stream_set_pos(data_out, pos);
stream_write(data_out, data, data_size);
error = svc_plugin_send((rdpSvcPlugin*)drdynvc, data_out);
}
else
{
/* Fragment the data */
cbLen = drdynvc_write_variable_uint(data_out, data_size);
pos = stream_get_pos(data_out);
stream_set_pos(data_out, 0);
stream_write_uint8(data_out, 0x20 | cbChId | (cbLen << 2));
stream_set_pos(data_out, pos);
chunk_len = CHANNEL_CHUNK_LENGTH - pos;
stream_write(data_out, data, chunk_len);
data += chunk_len;
data_size -= chunk_len;
error = svc_plugin_send((rdpSvcPlugin*)drdynvc, data_out);
while (error == CHANNEL_RC_OK && data_size > 0)
{
data_out = stream_new(CHANNEL_CHUNK_LENGTH);
stream_set_pos(data_out, 1);
cbChId = drdynvc_write_variable_uint(data_out, ChannelId);
pos = stream_get_pos(data_out);
stream_set_pos(data_out, 0);
stream_write_uint8(data_out, 0x30 | cbChId);
stream_set_pos(data_out, pos);
chunk_len = data_size;
if (chunk_len > CHANNEL_CHUNK_LENGTH - pos)
chunk_len = CHANNEL_CHUNK_LENGTH - pos;
stream_write(data_out, data, chunk_len);
data += chunk_len;
data_size -= chunk_len;
error = svc_plugin_send((rdpSvcPlugin*)drdynvc, data_out);
}
}
if (error != CHANNEL_RC_OK)
{
DEBUG_WARN("VirtualChannelWrite failed %d", error);
return 1;
}
return 0;
}
int drdynvc_push_event(drdynvcPlugin* drdynvc, FRDP_EVENT* event)
{
int error;
error = svc_plugin_send_event((rdpSvcPlugin*)drdynvc, event);
if (error != CHANNEL_RC_OK)
{
DEBUG_WARN("pVirtualChannelEventPush failed %d", error);
return 1;
}
return 0;
}
static int drdynvc_process_capability_request(drdynvcPlugin* drdynvc, int Sp, int cbChId, STREAM* data_in)
{
STREAM* data_out;
int error;
DEBUG_DVC("Sp=%d cbChId=%d", Sp, cbChId);
stream_seek(data_in, 1); /* pad */
stream_read_uint16(data_in, drdynvc->version);
if (drdynvc->version == 2)
{
stream_read_uint16(data_in, drdynvc->PriorityCharge0);
stream_read_uint16(data_in, drdynvc->PriorityCharge1);
stream_read_uint16(data_in, drdynvc->PriorityCharge2);
stream_read_uint16(data_in, drdynvc->PriorityCharge3);
}
data_out = stream_new(4);
stream_write_uint16(data_out, 0x0050); /* Cmd+Sp+cbChId+Pad. Note: MSTSC sends 0x005c */
stream_write_uint16(data_out, drdynvc->version);
error = svc_plugin_send((rdpSvcPlugin*)drdynvc, data_out);
if (error != CHANNEL_RC_OK)
{
DEBUG_WARN("VirtualChannelWrite failed %d", error);
return 1;
}
return 0;
}
static uint32 drdynvc_read_variable_uint(STREAM* stream, int cbLen)
{
uint32 val;
switch (cbLen)
{
case 0:
stream_read_uint8(stream, val);
break;
case 1:
stream_read_uint16(stream, val);
break;
default:
stream_read_uint32(stream, val);
break;
}
return val;
}
static int drdynvc_process_create_request(drdynvcPlugin* drdynvc, int Sp, int cbChId, STREAM* data_in)
{
STREAM* data_out;
int pos;
int error;
uint32 ChannelId;
ChannelId = drdynvc_read_variable_uint(data_in, cbChId);
pos = stream_get_pos(data_in);
DEBUG_DVC("ChannelId=%d ChannelName=%s", ChannelId, stream_get_tail(data_in));
error = dvcman_create_channel(drdynvc->channel_mgr, ChannelId, (char*)stream_get_tail(data_in));
data_out = stream_new(pos + 4);
stream_write_uint8(data_out, 0x10 | cbChId);
stream_set_pos(data_in, 1);
stream_copy(data_out, data_in, pos - 1);
if (error == 0)
{
DEBUG_DVC("channel created");
stream_write_uint32(data_out, 0);
}
else
{
DEBUG_DVC("no listener");
stream_write_uint32(data_out, (uint32)(-1));
}
error = svc_plugin_send((rdpSvcPlugin*)drdynvc, data_out);
if (error != CHANNEL_RC_OK)
{
DEBUG_WARN("VirtualChannelWrite failed %d", error);
return 1;
}
return 0;
}
static int drdynvc_process_data_first(drdynvcPlugin* drdynvc, int Sp, int cbChId, STREAM* data_in, int in_length)
{
int pos;
uint32 ChannelId;
uint32 Length;
int error;
ChannelId = drdynvc_read_variable_uint(data_in, cbChId);
Length = drdynvc_read_variable_uint(data_in, Sp);
pos = stream_get_pos(data_in);
DEBUG_DVC("ChannelId=%d Length=%d", ChannelId, Length);
error = dvcman_receive_channel_data_first(drdynvc->channel_mgr, ChannelId, Length);
if (error)
return error;
return dvcman_receive_channel_data(drdynvc->channel_mgr, ChannelId,
stream_get_tail(data_in), in_length - pos);
}
static int drdynvc_process_data(drdynvcPlugin* drdynvc, int Sp, int cbChId, STREAM* data_in, int in_length)
{
int pos;
uint32 ChannelId;
ChannelId = drdynvc_read_variable_uint(data_in, cbChId);
pos = stream_get_pos(data_in);
DEBUG_DVC("ChannelId=%d", ChannelId);
return dvcman_receive_channel_data(drdynvc->channel_mgr, ChannelId,
stream_get_tail(data_in), in_length - pos);
}
static int drdynvc_process_close_request(drdynvcPlugin* drdynvc, int Sp, int cbChId, STREAM* data_in)
{
uint32 ChannelId;
ChannelId = drdynvc_read_variable_uint(data_in, cbChId);
DEBUG_DVC("ChannelId=%d", ChannelId);
dvcman_close_channel(drdynvc->channel_mgr, ChannelId);
return 0;
}
static void drdynvc_process_receive(rdpSvcPlugin* plugin, STREAM* data_in)
{
drdynvcPlugin* drdynvc = (drdynvcPlugin*)plugin;
int in_length;
int value;
int Cmd;
int Sp;
int cbChId;
in_length = stream_get_length(data_in);
stream_set_pos(data_in, 0);
stream_read_uint8(data_in, value);
Cmd = (value & 0xf0) >> 4;
Sp = (value & 0x0c) >> 2;
cbChId = (value & 0x03) >> 0;
DEBUG_DVC("in_length=%d Cmd=0x%x", in_length, Cmd);
switch (Cmd)
{
case CAPABILITY_REQUEST_PDU:
drdynvc_process_capability_request(drdynvc, Sp, cbChId, data_in);
break;
case CREATE_REQUEST_PDU:
drdynvc_process_create_request(drdynvc, Sp, cbChId, data_in);
break;
case DATA_FIRST_PDU:
drdynvc_process_data_first(drdynvc, Sp, cbChId, data_in, in_length);
break;
case DATA_PDU:
drdynvc_process_data(drdynvc, Sp, cbChId, data_in, in_length);
break;
case CLOSE_REQUEST_PDU:
drdynvc_process_close_request(drdynvc, Sp, cbChId, data_in);
break;
default:
DEBUG_WARN("unknown drdynvc cmd 0x%x", Cmd);
break;
}
stream_free(data_in);
}
static void drdynvc_process_connect(rdpSvcPlugin* plugin)
{
drdynvcPlugin* drdynvc = (drdynvcPlugin*)plugin;
DEBUG_DVC("connecting");
drdynvc->channel_mgr = dvcman_new(drdynvc);
dvcman_load_plugin(drdynvc->channel_mgr, svc_plugin_get_data(plugin));
dvcman_init(drdynvc->channel_mgr);
}
static void drdynvc_process_event(rdpSvcPlugin* plugin, FRDP_EVENT* event)
{
freerdp_event_free(event);
}
static void drdynvc_process_terminate(rdpSvcPlugin* plugin)
{
drdynvcPlugin* drdynvc = (drdynvcPlugin*)plugin;
DEBUG_DVC("terminating");
if (drdynvc->channel_mgr != NULL)
dvcman_free(drdynvc->channel_mgr);
xfree(drdynvc);
}
DEFINE_SVC_PLUGIN(drdynvc, "drdynvc",
CHANNEL_OPTION_INITIALIZED | CHANNEL_OPTION_ENCRYPT_RDP |
CHANNEL_OPTION_COMPRESS_RDP)