Re: [NSE] (RFC) LLTD (Link Layer Topology Discovery)

[Daniel Miller <bonsaiviking () gmail com>]

On 09/26/2011 05:23 PM, Gorjan Petrovski wrote:
> I've committed it as r26706. If there are any comments/suggestions
> please share them.
I tried running this script from the latest SVN, and I am getting an error:
> NSE: lltd-discovery threw an error!
> ...r/local/bin/../share/nmap/scripts/lltd-discovery.nse:191: attempt 
> to concatenate local 'l2' (a nil value)
> stack traceback:
>     ...r/local/bin/../share/nmap/scripts/lltd-discovery.nse:191: in 
> function 'main'
>     /usr/local/bin/../share/nmap/nse_main.lua:718: in function 
> </usr/local/bin/../share/nmap/nse_main.lua:718>
I think it's only happening because nothing on my network is responding, 
but here's a patch to clean it up anyway:
Index: lltd-discovery.nse
===================================================================
--- lltd-discovery.nse    (revision 26717)
+++ lltd-discovery.nse    (working copy)
@@ -188,12 +188,11 @@
     local start_s = os.time()
     while true do
         local status, plen, l2, l3, _ = pcap:pcap_receive()
-        local packet = l2..l3
         if status then
+            local packet = l2..l3
             if stdnse.tohex(packet:sub(13,14)) == "88d9" then
                 start_s = os.time()

-                local packet=l2..l3
                 local ipv4, mac, ipv6 = parseHello(packet)

                 if ipv4 then

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