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remove vLAN tags for DHCP discover script #2819

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remove vLAN tags for DHCP discover script #2819

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7 changes: 6 additions & 1 deletion scripts/broadcast-dhcp-discover.nse
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Original file line number Diff line number Diff line change
Expand Up @@ -184,9 +184,14 @@ local function dhcp_listener(sock, iface, macaddr, options, timeout, xid, result
local now = start_time
while( now - start_time < timeout ) do
sock:set_timeout(timeout - (now - start_time))
local status, _, _, data = sock:pcap_receive()
local status, _, l2_data, data = sock:pcap_receive()

if ( status ) then
-- do we have a vlan tag to be removed?
local f = packet.Frame:new( l2_data )
if ( 0x8100 == f.ether_type and 4 <= #data ) then
data = string.sub( data, 5, -1)
end
local p = packet.Packet:new( data, #data )
if ( p and p.udp_dport ) then
local data = data:sub(p.udp_offset + 9)
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