Cavemanon/Nginx-Lua-Anti-DDoS
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Update anti_ddos_challenge.lua

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Bug Fix : Fixed Memory leak issue https://github.com/C0nw0nk/Nginx-Lua-Anti-DDoS/issues/21 `anti_ddos_challenge.lua: in function 'stringrandom'`
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C0nw0nk
2020-03-05 20:59:00 +00:00
committed by GitHub
parent 9fb67fef2b
commit eeee46a135
1 changed files with 5 additions and 3 deletions
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lua/anti_ddos_challenge.lua
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@ -1221,11 +1221,12 @@ local function stringrandom(length)
if length > 0 then if length > 0 then
local output = stringrandom(length - 1) .. charset[math.random(1, #charset)] local output = stringrandom(length - 1) .. charset[math.random(1, #charset)]
local duplicate_found = 0 --mark if we find a duplicate or not local duplicate_found = 0 --mark if we find a duplicate or not
for _, value in next, stringrandom_table do --for each value in our generated var table for key, value in pairs(stringrandom_table) do --for each value in our generated var table
if value == output then --if a value in our table matches our generated var if value == output then --if a value in our table matches our generated var
duplicate_found = 1 --mark as duplicate var duplicate_found = 1 --mark as duplicate var
output = "_" .. output --append an underscore to the duplicate var output = "_" .. output --append an underscore to the duplicate var
table.insert(stringrandom_table , output) --insert to the table table.insert(stringrandom_table , output) --insert to the table
break --break out of for each loop since we found a duplicate
end end
end end
if duplicate_found == 0 then --if no duplicate found if duplicate_found == 0 then --if no duplicate found
@ -1272,7 +1273,7 @@ local function encrypt_javascript(string1, type, defer_async, num_encrypt, encry
local output = "" --Empty var local output = "" --Empty var
if type == 0 then if type == 0 then
type = math.random(4, 4) --Random encryption type = math.random(3, 5) --Random encryption
end end
if type == 1 or type == nil then --No encryption if type == 1 or type == nil then --No encryption
@ -1381,9 +1382,10 @@ local function encrypt_javascript(string1, type, defer_async, num_encrypt, encry
local r = math.random(1, l) --randomize where to split string local r = math.random(1, l) --randomize where to split string
local chunks = {} --create our chunks table for string storage local chunks = {} --create our chunks table for string storage
local chunks_order = {} --create our chunks table for string storage that stores the value only local chunks_order = {} --create our chunks table for string storage that stores the value only
local random_var = nil --create our random string variable to use
while i <= l do while i <= l do
local random_var = stringrandom(stringrandom_length) --create a random variable name to use random_var = stringrandom(stringrandom_length) --create a random variable name to use
--table.insert(chunks_order, "decodeURIComponent(escape(window.atob(_" .. random_var .. ")))") --table.insert(chunks_order, "decodeURIComponent(escape(window.atob(_" .. random_var .. ")))")
table.insert(chunks_order, "_" .. random_var .. "") --insert the value into our ordered table table.insert(chunks_order, "_" .. random_var .. "") --insert the value into our ordered table
table.insert(chunks, 'var _' .. random_var .. '="' .. base64_javascript:sub(i,i+r).. '";') --insert our value into our table we will scramble table.insert(chunks, 'var _' .. random_var .. '="' .. base64_javascript:sub(i,i+r).. '";') --insert our value into our table we will scramble