MATE: SS7 GSM-MAP: how to correlate msu with same OTID value

asked 2022-10-14 13:49:44 +0000

Dear Colleagues, I would need some guidance to build a mate logic to correlate SS7 (GSM-MAP) messages. The common point of theses messages is the OTID value that can be found in the TCAP Begin message (start), so , all messages having this value in OTID (Origin TransactionID) or DTID (Destination Transaction ID) field would match. The stop would be TCAP END messages. Could the below trial be workable?

Pdu ss7_pdu Transport stcp { Extract otid From tcap.otid; };

Gop ss7_req On ss7_pdu Match (tcap.tid) { Start (tcap.begin_element); Stop (tcap.end_element); }; Done;

Thanks in advance Pascal

answered 2022-10-14 21:26:21 +0000

Chuckc
3023 ●6 ●611 ●20

This is a combination of your code and the 12.4.2. A Gop for HTTP requests in the WSUG.

Pdu ss7_pdu Proto tcap Transport ip {
    Extract tid From tcap.tid;
    Extract tcap_begin From tcap.begin_element;
    Extract tcap_end From tcap.end_element;
};

Gop ss7_req On ss7_pdu Match (tid) {
    Start (tcap_begin);
    Stop (tcap_end);
};

Done;

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Thanks Chuckc, it's indeed working, nice. I realize that using mate.ss7_pdu.tid == "dd:42:09:05" is the same as using basic wireshark filter: tcap.tid == dd:42:09:05 So, that's not bringing the expected facilities unfortunately. I'd like to find a way to allow wireshark to group msu with the tid by simply sorting a column. But that does not seem to be possible Thanks for the help Pascal

PhiPas ( 2022-10-20 15:55:38 +0000 )edit

There's a lot more flexibility if you're open to using a lua script.
Here is an example implementing modulo before it was added in Wireshark 4.0 (What’s New In Wireshark 4.0?):

Is there any way to obtain every 2nd, 3th, 7th etc. packet?

If you can define a way to group the packets, it's pretty easy to set a new field with a marker for that group.

Chuckc ( 2022-10-20 16:06:40 +0000 )edit

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