On Aug 19, 2010, at 2:09 PM, Peter Palúch wrote: > Greetings,
Questions such as this should be sent to [email protected], not to particular people on that list. There's no guarantee that a particular person on the list would have the answer, or would give the best answer by themselves. > I am trying to make an addition to the STP BPDU dissector in Wireshark, in > particular, adding the decoding of an extra field at the very end of Cisco > PVST+/RPVST+ BPDUs that contains the VLAN ID to which the BPDU belongs (this > value is used by Cisco to detect native VLAN mismatches). > > However, this is my first time I am trying to add a new code to the > Wireshark, and I am still only getting familiar with the API. > > I would like to ask if there is a recommended way how to ask for the LLC/SNAP > Ethernet header values in the packet-bpdu.c dissector. No, but there's a recommended way to solve this problem: Have separate dissectors for STP/RSTP and PVST+/RPVST+, but have those dissectors do all their work by calling a common routine, which does all the dissection, and which takes an additional gboolean argument to indicate whether this is regular STP or PVST+. Register the PVST+/RPVST+ dissector in the "llc.cisco_pid" dissector table with the PID 0x010b. > The extra BPDU field with the originating VLAN is present only in > PVST+/RPVST+ frames (SNAP OUI: 0x00000c, SNAP PID: 0x010b) and I need to > verify that type before trying to decode the field. I was looking on the > packet_info structure but it did not seem to carry any similar information > into the BDPU dissector. > > I am very thankful for any suggestion! ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <[email protected]> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:[email protected]?subject=unsubscribe
