Wireshark mailing list archives
Determining how Wireshark detects T.38
From: Rayne <hjazz6 () ymail com>
Date: Tue, 21 Jun 2016 09:17:03 +0000 (UTC)
Hi all, I'm trying to follow the Wireshark source code to find out exactly how Wireshark determines that the layer above UDP or RTP is a T.38 payload. I assume that a heuristic dissector is used since there is no known port for T.38. So I started with packet-udp.c, and eventually got to the line below in the function "decode_udp_ports()". if (dissector_try_heuristic(heur_subdissector_list, next_tvb, pinfo, tree, &hdtbl_entry, NULL)) However, when I looked at the definition of "dissector_try_heuristic()", I don't see anything that would lead me to the code where the T.38 heuristic dissector is called. I also don't see any code that tests if a payload should be decoded as "T.38" in packet-t38.c. This is my long way of asking, where can I find the code that tests if the payload is T.38, for both UDP and RTP packets? Thank you. Regards,Rayne
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Current thread:
- Determining how Wireshark detects T.38 Rayne (Jun 21)
- Re: Determining how Wireshark detects T.38 Guy Harris (Jun 21)
- Re: Determining how Wireshark detects T.38 Rayne (Jun 21)
- Re: Determining how Wireshark detects T.38 Guy Harris (Jun 21)
- Re: Determining how Wireshark detects T.38 Rayne (Jun 21)
- Re: Determining how Wireshark detects T.38 Guy Harris (Jun 21)