Title: Controlling Tshark output format
Hi all
I'm looking at implementing a feature from the Wishlist that we would like as well: the ability to control the output of tshark e.g.
tshark -Tfields -e ip - e udp - e tcp.port
This new format would produce a line per packet, but would do full dissection. "ip" would dump out the whole representation for the "ip" field.
For the command line parameters, I'm planning to enforce both an output type switch (-Tfields) and at least one field entry (-e). This leaves open the possibility of combining "-e" with other verbose options (pdml, verbose text) if people want it.
I've picked -e because it was free and the example in the Wishlist uses it. I don't think it's particularly appropriate, but ones that might have been are gone.
I also prefer to have multiple fields as multiple -e statements rather than one with a quoted, space separated list e.g -e "ip udp tcp.port"; largely because it saves having to add another layer of (admittedly trivial) parsing code.
It would be good to also have options controlling how this works in detail:
(a) An optional first "header" line listing the selected fields
(b) An option to control the separator (I'm defaulting to tab because that doesn't tend to come up in Wireshark output)
but I don't want to clutter the options list any more. Can anyone think of an elegant way to do this?
I'd also like to hijack the -c option to only read in the first "n" packets of a file, rather than just for live capture as at the moment.
Comments / suggestions?
Cheers
Doug
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