tpkt.c File Reference

#include <freerdp/config.h>
#include "tpdu.h"
#include "tpkt.h"
#include <winpr/wlog.h>

Macros
#define	TAG   FREERDP_TAG("core.tpkt")

Functions
int	tpkt_verify_header (wStream *s)
BOOL	tpkt_read_header (wStream *s, UINT16 *length)
BOOL	tpkt_ensure_stream_consumed_ (wStream *s, size_t length, const char *fkt)
BOOL	tpkt_write_header (wStream *s, size_t length)

Macro Definition Documentation

TAG

#define TAG   FREERDP_TAG("core.tpkt")

FreeRDP: A Remote Desktop Protocol Implementation Transport Packets (TPKTs)

Copyright 2011 Marc-Andre Moreau marca.nosp@m.ndre.nosp@m..more.nosp@m.au@g.nosp@m.mail..nosp@m.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.

Function Documentation

tpkt_ensure_stream_consumed_()

BOOL tpkt_ensure_stream_consumed_	(	wStream *	s,
		size_t	length,
		const char *	fkt
	)

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tpkt_read_header()

BOOL tpkt_read_header	(	wStream *	s,
		UINT16 *	length
	)

Read a TPKT header.

Parameters

s	A stream to read from
length	A pointer to the result, must not be NULL

Returns

TRUE for success, FALSE otherwise

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tpkt_verify_header()

int tpkt_verify_header

(

wStream *

s

)

TPKTs are defined in:

http://tools.ietf.org/html/rfc1006/ RFC 1006 - ISO Transport Service on top of the TCP

http://www.itu.int/rec/T-REC-T.123/ ITU-T T.123 (01/2007) - Network-specific data protocol stacks for multimedia conferencing

  TPKT Header

____________________ byte | | | 3 (version) | 1 |____________________| | | | Reserved | 2 |____________________| | | | Length (MSB) | 3 |____________________| | | | Length (LSB) | 4 |____________________| | | | 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. Verify if a packet has valid TPKT header.

Parameters

s	A stream to read from

Returns

TRUE for success, FALSE otherwise

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tpkt_write_header()

BOOL tpkt_write_header	(	wStream *	s,
		size_t	length
	)

Write a TPKT header.

Parameters

s	A stream to write to
length	The value to write

Returns

TRUE for success, FALSE otherwise

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