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Use STUN RFC magic number to filter for such packets

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Simon Walton 2019-05-29 18:10:48 -07:00
parent abce60e356
commit ddffa62468
1 changed files with 4 additions and 1 deletions
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5
tools/dissectors/1-hfudt.lua
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@ -163,10 +163,13 @@ local unsourced_packet_types = {
local fragments = {} local fragments = {}
local RFC_5389_MAGIC_COOKIE = 0x2112A442
function p_hfudt.dissector(buf, pinfo, tree) function p_hfudt.dissector(buf, pinfo, tree)
-- make sure this isn't a STUN packet - those don't follow HFUDT format -- make sure this isn't a STUN packet - those don't follow HFUDT format
if pinfo.dst == Address.ip("stun.highfidelity.io") then return end -- if pinfo.dst == Address.ip("stun.highfidelity.io") then return end
if buf(4, 4):uint() == RFC_5389_MAGIC_COOKIE then return end
-- validate that the packet length is at least the minimum control packet size -- validate that the packet length is at least the minimum control packet size
if buf:len() < 4 then return end if buf:len() < 4 then return end