tshark option for reassembled fragment output

[Hadriel Kaplan <HKaplan () acmepacket com>]

Howdy,
About a year ago r41216 fixed bug 3315, so that fragments which contributed to a reassembled PDU that matched a 
display-filter would be exported along with the filter-matching PDU's final frame.  I.e., suppose I have a 
display-filter of 'sip' and frame #3 is the only frame displayed because it matches the filter; but it was really the 
reassembled PDU of frames #2 and #3 because they were fragmented IP or separate TCP segments... then both frames #2 and 
#3 would be exported even if I choose to only export "displayed" frames.

That fix was great, but only done in Wireshark not tshark.  Even in two-pass mode (opt '-2'), tshark won't print/write 
the fragments which contributed to the reassembled PDU.  Thus there're bugs 8223 and 8101, and 
http://ask.wireshark.org/questions/18975

I have a patch to fix it, using the same function code as Wireshark.  It only works in two-pass mode, since one has to 
do two passes to accomplish it; but when enabled it changes how the original '-2' two-pass mode displays its output.

So the tricky thing, and the reason for this email, is whether it needs a new option such as '-Y', or even '-Y <display 
filter>'.  I currently have it as a new '-Y <display-filter>', which automatically does a two-pass analysis and ignores 
the -2 option, and prevents the user from doing both -R and -Y at the same time by error-ing out.  I should probably 
have it error-out if the user indicates '-2' at the same time, too.  It leaves the current behavior of '-R' and '-2' 
unchanged when they're used as before.

Does anyone have any preference/better-idea for how to indicate this new option?

-hadriel

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