![Luis Ontanon](/assets/img/avatar_default.png)
correct example and documentation about register_menu() my own: do not fail to make init.lua when building in a different dir svn path=/trunk/; revision=24879
177 lines
5.7 KiB
XML
177 lines
5.7 KiB
XML
<!-- $Id$ -->
|
|
<chapter id="wsluarm">
|
|
<title>Lua Support in Wireshark</title>
|
|
<section id="wsluarm_intro">
|
|
<title>Introduction</title>
|
|
<para>
|
|
Wireshark has an embedded Lua interpreter. Lua is a powerful light-weight
|
|
programming language designed for extending applications. Lua is designed
|
|
and implemented by a team at PUC-Rio, the Pontifical Catholic University
|
|
of Rio de Janeiro in Brazil. Lua was born and raised at Tecgraf, the
|
|
Computer Graphics Technology Group of PUC-Rio, and is now housed at Lua.org.
|
|
Both Tecgraf and Lua.org are laboratories of the Department of Computer Science.
|
|
</para>
|
|
<para>
|
|
In Wireshark Lua can be used to write dissectors and taps.
|
|
</para>
|
|
<para>
|
|
Wireshark's Lua interpreter starts by loading <command>init.lua</command> that
|
|
is located in the global configuration directory of Wireshark.
|
|
Lua is disabled by default by setting the variable <command>disable_lua</command>
|
|
to true in <command>init.lua</command>. To enable lua the line that sets that variable
|
|
must be removed or commented out.
|
|
</para>
|
|
<para>
|
|
After loading <command>init.lua</command> from the data directory if lua is enabled
|
|
Wireshark will try to load a file named <command>init.lua</command> in the user's
|
|
directory.
|
|
</para>
|
|
<para>
|
|
The command line option <command>-X lua_script:<file.lua></command> can be used to
|
|
load lua scripts as well.
|
|
</para>
|
|
<para>
|
|
The Lua code will be executed once after all the protocols have being initialized and before reading
|
|
any file.
|
|
</para>
|
|
</section>
|
|
<section id="wslua_dissector_example">
|
|
<title>Example of Dissector written in Lua</title>
|
|
<programlisting>
|
|
do
|
|
local p_multi = Proto("multi","MultiProto");
|
|
|
|
local vs_protos = {
|
|
[2] = "mtp2",
|
|
[3] = "mtp3",
|
|
[4] = "alcap",
|
|
[5] = "h248",
|
|
[6] = "ranap",
|
|
[7] = "rnsap",
|
|
[8] = "nbap"
|
|
}
|
|
|
|
local f_proto = ProtoField.uint8("multi.protocol","Protocol",base.DEC,vs_protos)
|
|
local f_dir = ProtoField.uint8("multi.direction","Direction",base.DEC,{ [1] = "incoming", [0] = "outgoing"})
|
|
local f_text = ProtoField.string("multi.text","Text")
|
|
|
|
p_multi.fields = { f_proto, f_dir, f_text }
|
|
|
|
local data_dis = Dissector.get("data")
|
|
|
|
local protos = {
|
|
[2] = Dissector.get("mtp2"),
|
|
[3] = Dissector.get("mtp3"),
|
|
[4] = Dissector.get("alcap"),
|
|
[5] = Dissector.get("h248"),
|
|
[6] = Dissector.get("ranap"),
|
|
[7] = Dissector.get("rnsap"),
|
|
[8] = Dissector.get("nbap"),
|
|
[9] = Dissector.get("rrc"),
|
|
[10] = DissectorTable.get("sctp.ppi"):get_dissector(3), -- m3ua
|
|
[11] = DissectorTable.get("ip.proto"):get_dissector(132), -- sctp
|
|
}
|
|
|
|
function p_multi.dissector(buf,pkt,root)
|
|
|
|
local t = root:add(p_multi,buf(0,2))
|
|
t:add(f_proto,buf(0,1))
|
|
t:add(f_dir,buf(1,1))
|
|
|
|
local proto_id = buf(0,1):uint()
|
|
|
|
local dissector = protos[proto_id]
|
|
|
|
if dissector ~= nil then
|
|
dissector:call(buf(2):tvb(),pkt,root)
|
|
elseif proto_id < 2 then
|
|
t:add(f_text,buf(2))
|
|
-- pkt.cols.info:set(buf(2,buf:len() - 3):string())
|
|
else
|
|
data_dis:call(buf(2):tvb(),pkt,root)
|
|
end
|
|
|
|
end
|
|
|
|
local wtap_encap_table = DissectorTable.get("wtap_encap")
|
|
local udp_encap_table = DissectorTable.get("udp.port")
|
|
|
|
wtap_encap_table:add(wtap.USER15,p_multi)
|
|
wtap_encap_table:add(wtap.USER12,p_multi)
|
|
udp_encap_table:add(7555,p_multi)
|
|
end
|
|
</programlisting>
|
|
</section>
|
|
<section id="wslua_tap_example">
|
|
<title>Example of Listener written in Lua</title>
|
|
<programlisting>
|
|
-- This program will register a menu that will open a window with a count of occurrences
|
|
-- of every address in the capture
|
|
|
|
do
|
|
local function menuable_tap()
|
|
-- Declare the window we will use
|
|
local tw = TextWindow.new("Address Counter")
|
|
|
|
-- This will contain a hash of counters of appereances of a certain address
|
|
local ips = {}
|
|
|
|
-- this is our tap
|
|
local tap = Listener.new();
|
|
|
|
function remove()
|
|
-- this way we remove the listener than otherwise will remain running indifinitelly
|
|
tap:remove();
|
|
end
|
|
|
|
-- we tell the window to call the remove() function when closed
|
|
tw:set_atclose(remove)
|
|
|
|
-- this function will be called once for each packet
|
|
function tap.packet(pinfo,tvb)
|
|
local src = ips[tostring(pinfo.src)] or 0
|
|
local dst = ips[tostring(pinfo.dst)] or 0
|
|
|
|
ips[tostring(pinfo.src)] = src + 1
|
|
ips[tostring(pinfo.dst)] = dst + 1
|
|
end
|
|
|
|
-- this function will be called once every few seconds to update our window
|
|
function tap.draw(t)
|
|
tw:clear()
|
|
for ip,num in pairs(ips) do
|
|
tw:append(ip .. "\t" .. num .. "\n");
|
|
end
|
|
end
|
|
|
|
-- this function will be called whenever a reset is needed
|
|
-- e.g. when reloading the capture file
|
|
function tap.reset()
|
|
tw:clear()
|
|
ips = {}
|
|
end
|
|
end
|
|
|
|
-- using this function we register our fuction
|
|
-- to be called when the user selects the Tools->Test->Packets menu
|
|
register_menu("Test/Packets", menuable_tap, MENU_TOOLS)
|
|
end
|
|
</programlisting>
|
|
</section>
|
|
<section id="wsluarm_modules">
|
|
<title>Wireshark's Lua API Reference Manual</title>
|
|
<para>
|
|
This Part of the User Guide describes the Wireshark specific functions in the embedded Lua.
|
|
</para>
|
|
&WsLuaDumper;
|
|
&WsLuaField;
|
|
&WsLuaGui;
|
|
&WsLuaListener;
|
|
&WsLuaPinfo;
|
|
&WsLuaProto;
|
|
&WsLuaTree;
|
|
&WsLuaTvb;
|
|
&WsLuaUtility;
|
|
</section>
|
|
</chapter>
|