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How to retrieve some info when I follow http session offline ?

asked 2022-06-06 14:25:26 +0000

Mific78 gravatar image

Hello,

I am trying to map HTTP Requests to Responses from a pcap file. I use the following script =>

image description

I'd like to put each request/response into a csv file with some attributes (Host, User-Agent, Status Code, Content-Length, etc...). Is it possible to do that directly with tshark ?

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answered 2022-06-07 10:00:06 +0000

Mific78 gravatar image

Update : This script meets my need (the "json.txt" file contains only the pairs requests/responses in JSON format) =>

for stream in `tshark -r "$1" -2 -R "tcp and (http.request or http.response)" -T fields -e tcp.stream | sort -n | uniq`
do
  tshark -q -r "$1" -z follow,http,ascii,"$stream" -Y "tcp.stream == "$stream" and (tcp and (http.request or http.response))" -T json -j "http" >> results.txt
done
sed "/"==================================================================="/,/"==================================================================="/d" results.txt > json.txt
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Comments

Instead of using the sed command to remove unwanted text, it is better to instruct tshark not to output it in the first place by removing the -z option (and -q).

I don’t see the need for the for-loop. You can output all http requests and responses in one go.

André gravatar imageAndré ( 2022-06-07 21:40:16 +0000 )edit
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answered 2022-06-06 17:28:48 +0000

André gravatar image

Use the -T fields option to selectively output fields. For example:

tshark -r "$1" -T fields -e http.server -e http.user_agent -e http.response.code -e http.content_length_header -e http.response_for.uri -Y http

Note: follow tcp-stream cannot be used if you want CSV format.
And in your example there is a space between 'ascii "$stream' that should be removed. See also tshark documentation.

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I tried to use the -T fields (see example below) but I got a large number of empty lines : it seems that there is a line by stream (http or not http ...) =>

for stream in `tshark -r "$1" -2 -R "tcp and (http.request or http.response)" -T fields -e tcp.stream | sort -n | uniq`
do
  tshark -q -r "$1" -z follow,http,ascii,"$stream" -T fields -e http.server -e http.user_agent >> results.txt
done
Mific78 gravatar imageMific78 ( 2022-06-06 18:17:06 +0000 )edit

You omitted the display filter (-Y). So for every packet that does not contain a requested field and empty field is outputted, resulting in a lot of lines with only tabs.

André gravatar imageAndré ( 2022-06-07 21:39:28 +0000 )edit

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Asked: 2022-06-06 14:25:26 +0000

Seen: 236 times

Last updated: Jun 07 '22