Ethereal-users: Re: [Ethereal-users] SCTP PPID for M3UA.
Dear all,
see my comments below.
Best regards
Michael
On Aug 18, 2004, at 3:43 PM, Jeff Morriss wrote:
Paul Jeffress wrote:
Hi,
We use SS7 equipment from two vendors, one of which does not use the
standard SCTP PPID of 3, for their M3UA packets. Instead they use 0.
I had a look at sctpppids.h and see
#define NOT_SPECIFIED_PROTOCOL_ID 0
#define IUA_PAYLOAD_PROTOCOL_ID 1
#define M2UA_PAYLOAD_PROTOCOL_ID 2
#define M3UA_PAYLOAD_PROTOCOL_ID 3
#define SUA_PAYLOAD_PROTOCOL_ID 4
Is there any way to cause Ethereal to interpret a PPID of 0 or 3 as
M3UA, so I can decode both my vendors M3UA correctly?.
I also had a look to try and change the code myself, but it's been
toooooo long since I've coded and could not figure it out.
Not without recompiling Ethereal. If you don't mind doing that, you
could change "epan/dissectors/packet-m3ua.c" to register for
NOT_SPECIFIED_PROTOCOL_ID here:
> dissector_add("sctp.ppi", M3UA_PAYLOAD_PROTOCOL_ID, m3ua_handle);
> dissector_add("sctp.port", SCTP_PORT_M3UA, m3ua_handle);
Another (probably better) alternative would be to modify the M3UA
dissector to register for whatever SCTP port your M3UA traffic is on
(instead of the well known port of 2905).
This does not work if the port changes from association to association
and
requires recompiling ethereal.
Actually, an even better idea would be to make the M3UA dissector's
SCTP port a configurable preference.
I thing the best idea is to add support for SCTP port number and PPID to
the 'Decode As' menu. I started that and added the possibility to
register
a dissector for PPID 0. Now I need to find a way to know which PPIDs
are all
used in a packet...
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