[GTALUG] Wireshark question -- script to extract data in TCP stream?

[Alvin Starr]

On 09/26/2017 07:11 AM, James Knott via talk wrote:
> On 09/26/2017 12:47 AM, William Park via talk wrote:
>> To network experts...
>>
>>  From Wireshark, I can click "TCP Follow" tab and extract one-way data
>> flow from a tcp stream.  I can do this manually, one by one.  But, I
>> have many many streams.
>>
>> Does anyone know how to extract one-way data stream via script?
>>
>> Google says
>>      tshark -q -r capture.pcapng -z follow,tcp,raw,0
>> where '0' is the tcp stream number 0.  But, it gives me data moving both
>> ways.  I just want data moving one-way.
> Doesn't following stream in Wireshark also capture both directions?
> Perhaps, after exporting, you could filter out what you need.
>

you could capture only one way traffic by filtering the input  with 
something like "dst host 1.2.3.4".
I am not sure how that would impact the  tcp stream following though.

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