Ethereal-dev: Re: [Ethereal-dev] nettl (HP-UX) Enhanced file handling

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From: Guy Harris <gharris@xxxxxxxxx>
Date: Tue, 08 Mar 2005 23:59:01 -0800
Mark C. Brown wrote:


Added nettl trace record specific fields: subsystem, trace kind,
device id, process id (actually kernel thread id for 10.X and
later), and user id...
It's a bit ugly to have special-case handling of nettl trace records in packet-frame.c, and the information in the nettl pseudo-header is at a different level from most if not all of the other pseudo-header stuff - and some link-layer types, such as Ethernet, supported by nettl already have pseudo-headers.
It'd be a Wiretap API change, so that'd be a bit of extra work, but perhaps an additional union, similar to the pseudo-header union, could be used for non-protocol-related pseudo-header information (and, in fact, some of the CoSine L2 debug header information is arguably not protocol related) - or the "union pseudo_header *" arguments could be replaced with pointers to a structure containing both the non-protocol-related and protocol-related information).
In addition, a dissector could register in a new "wtap_filetype" dissector table with a WTAP_FILE_ value, and the frame dissector would call the dissector for that, if one is found, before calling the dissector for the frame type.