/usr/share/ettercap/lua/core/dumper.lua is in ettercap-common 1:0.8.2-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- DataDumper.lua
-- Copyright (c) 2007 Olivetti-Engineering SA
--
-- Permission is hereby granted, free of charge, to any person
-- obtaining a copy of this software and associated documentation
-- files (the "Software"), to deal in the Software without
-- restriction, including without limitation the rights to use,
-- copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the
-- Software is furnished to do so, subject to the following
-- conditions:
--
-- The above copyright notice and this permission notice shall be
-- included in all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
-- OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
-- HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
-- WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-- FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-- OTHER DEALINGS IN THE SOFTWARE.
local dumplua_closure = [[
local closures = {}
local function closure(t)
closures[#closures+1] = t
t[1] = assert(loadstring(t[1]))
return t[1]
end
for _,t in pairs(closures) do
for i = 2,#t do
debug.setupvalue(t[1], i-1, t[i])
end
end
]]
local lua_reserved_keywords = {
'and', 'break', 'do', 'else', 'elseif', 'end', 'false', 'for',
'function', 'if', 'in', 'local', 'nil', 'not', 'or', 'repeat',
'return', 'then', 'true', 'until', 'while' }
local function keys(t)
local res = {}
local oktypes = { stringstring = true, numbernumber = true }
local function cmpfct(a,b)
if oktypes[type(a)..type(b)] then
return a < b
else
return type(a) < type(b)
end
end
for k in pairs(t) do
res[#res+1] = k
end
table.sort(res, cmpfct)
return res
end
local c_functions = {}
for _,lib in pairs{'_G', 'string', 'table', 'math',
'io', 'os', 'coroutine', 'package', 'debug'} do
local t = _G[lib] or {}
lib = lib .. "."
if lib == "_G." then lib = "" end
for k,v in pairs(t) do
if type(v) == 'function' and not pcall(string.dump, v) then
c_functions[v] = lib..k
end
end
end
function DataDumper(value, varname, fastmode, ident)
local defined, dumplua = {}
-- Local variables for speed optimization
local string_format, type, string_dump, string_rep =
string.format, type, string.dump, string.rep
local tostring, pairs, table_concat =
tostring, pairs, table.concat
local keycache, strvalcache, out, closure_cnt = {}, {}, {}, 0
setmetatable(strvalcache, {__index = function(t,value)
local res = string_format('%q', value)
t[value] = res
return res
end})
local fcts = {
string = function(value) return strvalcache[value] end,
number = function(value) return value end,
boolean = function(value) return tostring(value) end,
['nil'] = function(value) return 'nil' end,
['function'] = function(value)
return string_format("loadstring(%q)", string_dump(value))
end,
userdata = function() error("Cannot dump userdata") end,
thread = function() error("Cannot dump threads") end,
}
local function test_defined(value, path)
if defined[value] then
if path:match("^getmetatable.*%)$") then
out[#out+1] = string_format("s%s, %s)\n", path:sub(2,-2), defined[value])
else
out[#out+1] = path .. " = " .. defined[value] .. "\n"
end
return true
end
defined[value] = path
end
local function make_key(t, key)
local s
if type(key) == 'string' and key:match('^[_%a][_%w]*$') then
s = key .. "="
else
s = "[" .. dumplua(key, 0) .. "]="
end
t[key] = s
return s
end
for _,k in ipairs(lua_reserved_keywords) do
keycache[k] = '["'..k..'"] = '
end
if fastmode then
fcts.table = function (value)
-- Table value
local numidx = 1
out[#out+1] = "{"
for key,val in pairs(value) do
if key == numidx then
numidx = numidx + 1
else
out[#out+1] = keycache[key]
end
local str = dumplua(val)
out[#out+1] = str..","
end
if string.sub(out[#out], -1) == "," then
out[#out] = string.sub(out[#out], 1, -2);
end
out[#out+1] = "}"
return ""
end
else
fcts.table = function (value, ident, path)
if test_defined(value, path) then return "nil" end
-- Table value
local sep, str, numidx, totallen = " ", {}, 1, 0
local meta, metastr = (debug or getfenv()).getmetatable(value)
if meta then
ident = ident + 1
metastr = dumplua(meta, ident, "getmetatable("..path..")")
totallen = totallen + #metastr + 16
end
for _,key in pairs(keys(value)) do
local val = value[key]
local s = ""
local subpath = path
if key == numidx then
subpath = subpath .. "[" .. numidx .. "]"
numidx = numidx + 1
else
s = keycache[key]
if not s:match "^%[" then subpath = subpath .. "." end
subpath = subpath .. s:gsub("%s*=%s*$","")
end
s = s .. dumplua(val, ident+1, subpath)
str[#str+1] = s
totallen = totallen + #s + 2
end
if totallen > 80 then
sep = "\n" .. string_rep(" ", ident+1)
end
str = "{"..sep..table_concat(str, ","..sep).." "..sep:sub(1,-3).."}"
if meta then
sep = sep:sub(1,-3)
return "setmetatable("..sep..str..","..sep..metastr..sep:sub(1,-3)..")"
end
return str
end
fcts['function'] = function (value, ident, path)
if test_defined(value, path) then return "nil" end
if c_functions[value] then
return c_functions[value]
elseif debug == nil or debug.getupvalue(value, 1) == nil then
return string_format("loadstring(%q)", string_dump(value))
end
closure_cnt = closure_cnt + 1
local res = {string.dump(value)}
for i = 1,math.huge do
local name, v = debug.getupvalue(value,i)
if name == nil then break end
res[i+1] = v
end
return "closure " .. dumplua(res, ident, "closures["..closure_cnt.."]")
end
end
function dumplua(value, ident, path)
return fcts[type(value)](value, ident, path)
end
if varname == nil then
varname = "return "
elseif varname:match("^[%a_][%w_]*$") then
varname = varname .. " = "
end
if fastmode then
setmetatable(keycache, {__index = make_key })
out[1] = varname
table.insert(out,dumplua(value, 0))
return table.concat(out)
else
setmetatable(keycache, {__index = make_key })
local items = {}
for i=1,10 do items[i] = '' end
items[3] = dumplua(value, ident or 0, "t")
if closure_cnt > 0 then
items[1], items[6] = dumplua_closure:match("(.*\n)\n(.*)")
out[#out+1] = ""
end
if #out > 0 then
items[2], items[4] = "local t = ", "\n"
items[5] = table.concat(out)
items[7] = varname .. "t"
else
items[2] = varname
end
return table.concat(items)
end
end
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