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libfreerdp-core: started TPDU encoding/decoding

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This commit is contained in:
Marc-André Moreau 2011-07-02 17:10:10 -04:00
parent 071516187e
commit 37f3cff525
5 changed files with 176 additions and 10 deletions
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2
libfreerdp-core/CMakeLists.txt
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@ -30,6 +30,8 @@ set(LIBFREERDP_CORE_SRCS
# credssp.h
# ntlmssp.c
# ntlmssp.h
tpdu.c
tpdu.h
tpkt.c
tpkt.h
)

116
libfreerdp-core/tpdu.c Normal file
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@ -0,0 +1,116 @@
/**
* FreeRDP: A Remote Desktop Protocol Client
* X.224 Transport Protocol Data Units (TPDUs)
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* 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 "tpdu.h"
/**
* TPDUs are defined in:
*
* http://www.itu.int/rec/T-REC-X.224-199511-I/
* X.224: Information technology - Open Systems Interconnection - Protocol for providing the connection-mode transport service
*
* RDP uses only TPDUs of class 0, the "simple class" defined in section 8 of X.224
*
* TPDU Header
* ____________________ byte
* | |
* | LI | 1
* |____________________|
* | |
* | Code | 2
* |____________________|
* | |
* | | 3
* |_______DST-REF______|
* | |
* | | 4
* |____________________|
* | |
* | | 5
* |_______SRC-REF______|
* | |
* | | 6
* |____________________|
* | |
* | Class | 7
* |____________________|
* | ... |
*/
uint8
tpdu_read_header(STREAM* s, uint16 length)
{
uint8 li;
uint8 code;
stream_read_uint8(s, li); /* LI */
stream_read_uint8(s, code); /* Code */
if (code == X224_TPDU_DATA)
{
/* EOT (1 byte) */
stream_seek(s, 1);
}
else
{
/* DST-REF (2 bytes) */
/* SRC-REF (2 bytes) */
/* Class 0 (1 byte) */
stream_seek(s, 5);
}
return code;
}
void
tpdu_write_header(STREAM* s, uint16 length, uint8 code)
{
stream_write_uint8(s, length - 5); /* LI */
stream_write_uint8(s, code); /* code */
if (code == X224_TPDU_DATA)
{
stream_write_uint8(s, 0x80); /* EOT */
}
else
{
stream_write_uint16(s, 0); /* DST-REF */
stream_write_uint16(s, 0); /* SRC-REF */
stream_write_uint8(s, 0); /* Class 0 */
}
}
void
tpdu_write_connection_request(STREAM* s, uint16 length)
{
tpdu_write_header(s, length - 5, X224_TPDU_CONNECTION_REQUEST);
/* TODO: RDP_NEG_DATA */
}
void
tpdu_write_disconnect_request(STREAM* s, uint16 length)
{
tpdu_write_header(s, length - 5, X224_TPDU_DISCONNECT_REQUEST);
}
void
tpdu_write_data(STREAM* s, uint16 length)
{
tpdu_write_header(s, length - 5, X224_TPDU_DATA);
}

45
libfreerdp-core/tpdu.h Normal file
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@ -0,0 +1,45 @@
/**
* FreeRDP: A Remote Desktop Protocol Client
* X.224 Transport Protocol Data Units (TPDUs)
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* 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.
*/
#ifndef __TPDU_H
#define __TPDU_H
#include <freerdp/utils/stream.h>
enum X224_TPDU_TYPE
{
X224_TPDU_CONNECTION_REQUEST = 0xE0,
X224_TPDU_CONNECTION_CONFIRM = 0xD0,
X224_TPDU_DISCONNECT_REQUEST = 0x80,
X224_TPDU_DATA = 0xF0,
X224_TPDU_ERROR = 0x70
};
uint8
tpdu_read_header(STREAM* s, uint16 length);
void
tpdu_write_header(STREAM* s, uint16 length, uint8 code);
void
tpdu_write_connection_request(STREAM* s, uint16 length);
void
tpdu_write_disconnect_request(STREAM* s, uint16 length);
void
tpdu_write_data(STREAM* s, uint16 length);
#endif /* __TPDU_H */

18
libfreerdp-core/tpkt.c
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@ -1,6 +1,6 @@
/**
* FreeRDP: A Remote Desktop Protocol Client
* TPKT Headers
* Transport Packets (TPKTs)
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
@ -17,10 +17,12 @@
* limitations under the License.
*/
#include "tpdu.h"
#include "tpkt.h"
/**
* TPKT headers are defined in:
* TPKTs are defined in:
*
* http://tools.ietf.org/html/rfc1006/
* RFC 1006 - ISO Transport Service on top of the TCP
@ -43,13 +45,15 @@
* | Length (LSB) | 4
* |____________________|
* | |
* | TPDU | 5 - ?
* | X.224 TPDU | 5 - ?
* ....
*
* A TPKT header is of fixed length 4, and the following X.224 TPDU is at least three bytes long.
* Therefore, the minimum TPKT length is 7, and the maximum TPKT length is 65535. Because the TPKT
* length includes the TPKT header (4 bytes), the maximum X.224 TPDU length is 65531.
*/
#include <freerdp/utils/stream.h>
int
uint16
tpkt_read_header(STREAM* s)
{
uint8 version;
@ -65,7 +69,7 @@ tpkt_read_header(STREAM* s)
else
{
/* not a TPKT header */
length = -1;
length = 0;
}
return length;

5
libfreerdp-core/tpkt.h
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@ -1,6 +1,6 @@
/**
* FreeRDP: A Remote Desktop Protocol Client
* TPKT Headers
* Transport Packets (TPKTs)
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
@ -22,9 +22,8 @@
#include <freerdp/utils/stream.h>
int
uint16
tpkt_read_header(STREAM* s);
void
tpkt_write_header(STREAM* s, int length);