Ethereal-dev: [ethereal-dev] Re: Adding NetInfo (ONC RPC proto) support to ethereal
On Fri, Dec 31, 1999 at 04:21:54PM -0500, Nicolas Williams wrote:
Replying to myself. Apparently I emailed you too soon.
> I started adding NetInfo support to ethereal today.
>
> I've got a pretty complete packet-netinfobind.[ch] set of files and will
> probably start on packet-netinfo.[ch] once I get the netinfobind
> protocol stuff working.
>
> I need a feature added to packet-portmap.c: CALLIT call decoding. This
> is because NetInfo relies on indirect RPC calls via the portmapper for
> the most interesting (from a debugging point of view) operational aspect
> of NetInfo: binding (i.e., one domain finding servers for its parent
> domain).
[...]
> Currently there is no dissection done on CALLIT calls. I figure I can
> add a function to do it, but I need to know how to use the protocol,
> version and procedure numbers to find the dissection function for the
> encapsulated arguments. That and how to add a protocol sub-tree for the
> portmapper packet.
Well, I managed to code a dissect_rmtcall() function and it works with
unknown protocols at this point. I have to finish the NetInfo binder
protocol functions before I can complete testing of this function.
I had to change the rpc_progs and rpc_procs variables from packet-rpc.c
to be externs instead of statics so I could reference them in
packet-portmap.c to lookup the dissection function for the indirect
call.
Coding dissect_rmtcall_reply() will be a bit trickier because CALLIT
replies do not include information about what indirect prog/vers/proc
call is being answered, so I'll have to code the CALLIT call and reply
dissectors to store/find the indirect prog/vers/proc information in the
data field of the RPC conversation struct - it's not currently used, so
it's the perfect place for this.
> Any help would be much appreciated. Thanks,
I must say, ethereal is so well written that having never looked at
ethereal before this Friday I've already been able to add features.
Excellent. Congratulations on such a well designed program, and thank
you!
Nico
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