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How to call dissector for IPv6 next header

asked 2019-03-27 17:48:05 +0000

I am working on a Lua dissector for a new IPv6 hop-by-hop extension header we are developing in the IETF. See: https://tools.ietf.org/html/draft-hin...

I have gotten it to work to parse and display the header, but I don't know how to call the next dissector. It can be any IP protocol (TCP/UDP/etc.) as defined in https://www.iana.org/assignments/prot....

I can get it to work in a test case for UDP by using a static value:

     Dissector.get("udp"):call(buffer(aoptionlen):tvb(), pinfo, tree)

inside the function. How do I do this for the general case? I have the next header value in a variable.

Thanks in advance.

Bob

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answered 2019-03-27 18:43:59 +0000

grahamb gravatar image

Somewhat guessing, but maybe use dissectortable.get("ip.proto") to get the table of dissectors registered with ip, then use dissectortable::try() to call the appropriate entry from that table with the protocol value you have for the next header.

This is the Lua equivalent of what's done in the C IPv6 dissector.

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Asked: 2019-03-27 17:48:05 +0000

Seen: 37 times

Last updated: Mar 27