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-- Wireshark dissector for labstreamerlayer stream discovery packets
-- Place this file in $WIRESHARK_CONFIG_DIR/plugins/lsl.lua
-- (C) 2020 Tristan Stenner
do
local lsl_proto = Proto("lsldiscovery", "Labstreaminglayer Discovery")
-- source fields
local udp_src_f = Field.new("udp.srcport")
local udp_dst_f = Field.new("udp.dstport")
-- fields to be shown in the packet analysis pane
local cmd_F = ProtoField.string("lsl.cmd", "Command")
local dst_F = ProtoField.string("lsl.dst", "Destination")
local query_F = ProtoField.string("lsl.query", "QueryID", "QueryID")
local content_F = ProtoField.string("lsl.content", "Content", "Content")
local streaminfo_F = ProtoField.string("lsl.streaminfo", "Streaminfo", "Streaminfo")
local ansport_F = ProtoField.string('lsl.answerport', 'Answer port', 'Answer port')
lsl_proto.fields = {cmd_F, dst_F, query_F, ansport_F, streaminfo_F, content_F}
function lsl_proto.dissector(buffer, pinfo, tree)
if udp_dst_f().value == 16571 then
if buffer(0, 4):string()~='LSL:' then
return
end
local subtree = tree:add(lsl_proto, buffer)
local data = buffer():string()
local newlinepos = data:find('\r\n')
if newlinepos == nil then
return
end
subtree:add(cmd_F, buffer(0, newlinepos-1))
buffer = buffer(newlinepos + 1)
newlinepos = buffer():string():find('\r\n', newlinepos+1, true)
if newlinepos == nil then
return
end
subtree:add(content_F, buffer(0, newlinepos-1))
buffer = buffer(newlinepos + 1)
local wspos = buffer():string():find(' ')
subtree:add(ansport_F, buffer(0, wspos-1))
subtree:add(query_F, buffer(wspos))
elseif udp_src_f().value == 16571 then
local subtree = tree:add(lsl_proto, buffer)
subtree:add(cmd_F, 'shortinfo reply')
local data = buffer():string()
local newlinepos = data:find('\r\n')
if newlinepos == nil then
return
end
subtree:add(query_F, buffer(0, newlinepos-1))
buffer = buffer(newlinepos + 1)
subtree:add(streaminfo_F, buffer(newlinepos+1))
end
end
DissectorTable.get('udp.port'):add(16571, lsl_proto)
end
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