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Switch to tail-recursion

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This commit is contained in:
dmiller 2014-12-15 05:20:42 +00:00
parent 5f5af2d573
commit f9f2829e3c
1 changed files with 3 additions and 7 deletions
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10
scripts/modbus-discover.nse
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@ -63,10 +63,9 @@ local form_rsid = function(sid, functionId, data)
return "\0\0\0\0\0" .. bin.pack('CCC', payload_len, sid, functionId) .. data
end
discover_device_id_recursive = function(host, port, sid, start_id)
discover_device_id_recursive = function(host, port, sid, start_id, objects_table)
local rsid = form_rsid(sid, 0x2B, "\x0E\x01" .. bin.pack('C', start_id))
local status, result = comm.exchange(host, port, rsid)
local objects_table = {}
if ( status and (#result >= 8)) then
local ret_code = string.byte(result, 8)
if ( ret_code == 0x2B and #result >= 15 ) then
@ -87,10 +86,7 @@ discover_device_id_recursive = function(host, port, sid, start_id)
end
if ( more_follows == 0xFF and next_object_id ~= 0x00 ) then
stdnse.debug1("Has more objects")
local recursive_table = discover_device_id_recursive(host, port, sid, next_object_id)
for k,v in pairs(recursive_table) do
table.insert(objects_table, k, v)
end
return discover_device_id_recursive(host, port, sid, next_object_id, objects_table)
end
end
end
@ -98,7 +94,7 @@ discover_device_id_recursive = function(host, port, sid, start_id)
end
local discover_device_id = function(host, port, sid)
return discover_device_id_recursive(host, port, sid, 0x0)
return discover_device_id_recursive(host, port, sid, 0x0, {})
end
local extract_slave_id = function(response)