Option to control default follow stream view?

asked 2021-06-30 20:56:15 +0000

blincoln
3 ●1

Is there an option to set the follow stream view to something other than ASCII by default?

I'm looking at a packet capture of traffic that involves sending multi-MB XML blobs, and the blobs have no newline characters in them. Even on a recent laptop, WireShark is very slow to parse the stream when viewed in ASCII mode, on the order of 4 packets per second. I assume this is because of inefficiencies in soft-word-wrapping code either in WireShark itself or the OS. The total amount of traffic is something like 65MB, so even after a few hours, WireShark wasn't done following the stream. It runs at a reasonable speed in Hex Dump mode, but until I figured out the workaround below, I didn't think I could use that because the "Show data as" dropdown is greyed out until the stream has been parsed.

This is the workaround I'm using in the meantime: follow a different, shorter stream first. Wait for it to finish parsing. Switch to Hex Dump view. Change the Stream ID in the stream viewer to the ID of the problematic stream.

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On another note, would tshark -r <infile> -z "follow,tcp,ascii,#"(whare # is the flow number) be something useful for you?

Jaap ( 2021-07-01 05:54:55 +0000 )edit

I think the OP is looking for hex mode, so tshark -r <infile> -z "follow,tcp,hex,#"

grahamb ( 2021-07-01 07:58:46 +0000 )edit

Those are both very helpful as well. Thank you :).

blincoln ( 2021-07-05 17:31:16 +0000 )edit

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answered 2021-07-01 16:27:26 +0000

Chuckc
3023 ●6 ●608 ●20

Currently it is hard coded in follow_stream_dialog.cpp to start in ASCII view.

FollowStreamDialog::FollowStreamDialog(QWidget &parent, CaptureFile &cf, follow_type_t type) :
    WiresharkDialog(parent, cf),
    ui(new Ui::FollowStreamDialog),
    b_find_(NULL),
    follow_type_(type),
    follower_(NULL),
    show_type_(SHOW_ASCII),   <-********
    truncated_(false),

If extracting with tshark doesn't work out, you could open an enhancement request to configure
the Show data as value as a Wireshark preference and/or recent.

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#15963: "Follow UDP Stream" "Show and save data as" ASCII is default. Preference option necessary as Raw

Chuckc ( 2021-07-05 13:52:53 +0000 )edit

Thank you :).

blincoln ( 2021-07-05 17:30:35 +0000 )edit

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Option to control default follow stream view?

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Option to control default follow stream view?