Wireshark-dev: [Wireshark-dev] Dificulties in dissecting some packets
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From: <taraniteja.vishwanatha@xxxxxxxxx>
Date: Wed, 13 Dec 2006 16:11:04 +0530

Hi ,

I have encountered some problems when dissecting the packets for a protocol.I am mentioning 3 different scenarios

 

1.

In the below case , the octet is split into parts and each part viz x , y and z take different values.

I am not able to understand how to go about it.

 

                                                            PARAMETER 1                                       

7

6

5

4

3

2

1

0

octet

X

Y

Z

3

Number of Digits

4

Digit 2

Digit 1

5

Digit 4

Digit 3

6

Digit 2n

Digit 2n-1

n+4

SUB PARAMETER X

Value

Description

0
1

aaa
bbb

 

                                          SUB PARAMETER Y

Value

Description

0
1

2

3

A
B

C

D

 

 

2.

In the parameter mentioned below the value  may come in a range,. How can we dissect such values??

 

                                                                        PARAMETER 2

Value

Description

0
1-10
10-255

Not used
xxx
yyy

 

 

 

 

3.

In the following parameter, the value of each bit indicates if the assosiated version is currently used or not.

 

Value 0 :  not used

Value 1 : used

                                                                        PARAMETER 3

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

octet

 

 

 

 

 

 

 

 

 

 

Is it possible to include such informations, which depend upon whether a bit is set or not ,  in the dissector .

 

Regards ,

Tarani


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